<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Class X Math Assignment Generator</title>
    <link href="img/logo1.jpg" rel="icon">
    <!-- Add jsPDF library -->
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/1.4.1/html2canvas.min.js"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        /* All CSS styles remain the same as before */
        :root {
            --primary: #4361ee;
            --primary-dark: #3f37c9;
            --secondary: #4895ef;
            --danger: #f72585;
            --success: #4cc9f0;
            --light: #f8f9fa;
            --dark: #212529;
            --gray: #6c757d;
            --border-radius: 12px;
            --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #e2e8f0 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
            color: var(--dark);
            line-height: 1.6;
        }

        .container {
            width: 100%;
            max-width: 900px;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--box-shadow);
            overflow: hidden;
            transition: var(--transition);
            animation: fadeIn 0.5s ease-out;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .header {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: white;
            padding: 30px 20px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .header::before {
            content: '';
            position: absolute;
            top: -50px;
            right: -50px;
            width: 150px;
            height: 150px;
            background: rgba(255, 255, 255, 0.1);
            border-radius: 50%;
        }

        .header h1 {
            font-size: 2rem;
            margin-bottom: 10px;
            font-weight: 700;
            position: relative;
            z-index: 1;
        }

        .header p {
            font-size: 1rem;
            opacity: 0.9;
            position: relative;
            z-index: 1;
        }

        .content-area {
            padding: 30px;
        }

        .hidden {
            display: none !important;
        }

        .btn {
            display: inline-block;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            border: none;
            text-align: center;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
            margin: 10px 5px;
        }

        .btn-primary {
            background: var(--primary);
            color: white;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 15px rgba(67, 97, 238, 0.3);
        }

        .btn-success {
            background: var(--success);
            color: white;
        }

        .btn-success:hover {
            background: #3ab0d6;
            transform: translateY(-2px);
            box-shadow: 0 8px 15px rgba(76, 201, 240, 0.3);
        }

        .btn-danger {
            background: var(--danger);
            color: white;
        }

        .btn-danger:hover {
            background: #d3166b;
            transform: translateY(-2px);
            box-shadow: 0 8px 15px rgba(247, 37, 133, 0.3);
        }

        .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
            margin: 20px 0;
        }

        .section-title {
            text-align: center;
            margin-bottom: 25px;
            color: var(--primary-dark);
            font-size: 1.5rem;
            position: relative;
            padding-bottom: 10px;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background: var(--secondary);
            border-radius: 3px;
        }

        .checkbox-container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 15px;
            margin: 25px 0;
        }

        .checkbox-item {
            display: flex;
            align-items: center;
        }

        .checkbox-item input {
            margin-right: 10px;
            width: 18px;
            height: 18px;
            cursor: pointer;
        }

        .checkbox-item label {
            cursor: pointer;
            font-size: 0.95rem;
        }

        .generated-paper {
            padding: 30px;
        }

        .paper-header {
            text-align: center;
            margin-bottom: 30px;
            border-bottom: 2px solid var(--primary);
            padding-bottom: 20px;
        }

        .paper-header h2 {
            color: var(--primary-dark);
            margin-bottom: 5px;
            font-size: 1.8rem;
        }

        .paper-header h3 {
            color: var(--gray);
            margin-bottom: 5px;
            font-size: 1.2rem;
            font-weight: 500;
        }

        .paper-meta {
            display: flex;
            justify-content: space-between;
            margin-bottom: 25px;
            padding-bottom: 15px;
            border-bottom: 1px solid #eee;
            font-weight: 500;
        }

        .instructions {
            margin-bottom: 30px;
            padding: 20px;
            background: #f8f9fa;
            border-radius: var(--border-radius);
        }

        .instructions ol {
            padding-left: 20px;
            margin-top: 10px;
        }

        .instructions li {
            margin-bottom: 8px;
        }

        .question-section {
            margin-bottom: 30px;
        }

        .section-heading {
            font-weight: 600;
            color: var(--primary-dark);
            margin-bottom: 15px;
            padding-bottom: 5px;
            border-bottom: 1px solid #eee;
        }

        .question {
            margin-bottom: 20px;
            page-break-inside: avoid;
        }

        .question-text {
            font-weight: 500;
            margin-bottom: 8px;
        }

        .option {
            margin-left: 20px;
            margin-bottom: 5px;
        }

        .action-buttons {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 40px;
        }

        .assertion-reason {
            margin-left: 20px;
        }

        .case-study {
            background-color: #f8f9fa;
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 15px;
        }

        .case-study-question {
            margin-top: 10px;
        }

        @media (max-width: 768px) {
            .header h1 {
                font-size: 1.6rem;
            }
            
            .content-area {
                padding: 20px;
            }
            
            .checkbox-container {
                grid-template-columns: 1fr;
            }
            
            .btn {
                padding: 10px 20px;
                font-size: 0.9rem;
            }
            
            .paper-header h2 {
                font-size: 1.4rem;
            }
            
            .paper-header h3 {
                font-size: 1rem;
            }
        }

        @media (max-width: 480px) {
            .header {
                padding: 20px 15px;
            }
            
            .section-title {
                font-size: 1.3rem;
            }
            
            .paper-meta {
                flex-direction: column;
                gap: 10px;
            }
            
            .action-buttons {
                flex-direction: column;
                align-items: center;
            }
            
            .btn {
                width: 100%;
                max-width: 250px;
            }
        }

        @media print {
            body {
                background: none;
                padding: 0;
            }
            
            .container {
                box-shadow: none;
                max-width: 100%;
            }
            
            .action-buttons {
                display: none;
            }
            
            .question {
                page-break-inside: avoid;
            }
        }
    </style>
    <style>
        /* Ensure header styling is preserved */
        .header {
            background: linear-gradient(135deg, #4361ee, #3f37c9) !important;
            color: white !important;
            padding: 30px 20px !important;
            text-align: center !important;
            position: relative !important;
            overflow: hidden !important;
            width: 100% !important;
        }
        
        .header h1, .header h2, .header h3 {
            color: white !important;
            font-weight: bold !important;
        }
        
        .temp-pdf-container {
            font-family: Arial, sans-serif;
            line-height: 1.5;
            width: 794px; /* A4 width in pixels (210mm) */
            background-color: white;
            color: black;
        }
        
        /* Page break control */
        .question {
            page-break-inside: avoid;
            break-inside: avoid;
        }
        
        .question-section {
            page-break-after: auto;
        }
        
        @media print {
            body {
                margin: 0 !important;
                padding: 0 !important;
                background: white !important;
            }
            .container {
                width: 100% !important;
                margin: 0 !important;
                padding: 0 !important;
                box-shadow: none !important;
            }
            .header {
                -webkit-print-color-adjust: exact !important;
                print-color-adjust: exact !important;
            }
        }
        
        /* Home icon styles */
        .home-icon {
            position: absolute;
            top: 20px;
            left: 20px;
            color: white;
            font-size: 24px;
            cursor: pointer;
            transition: var(--transition);
            z-index: 2;
        }

        .home-icon:hover {
            transform: scale(1.1);
            color: rgba(255, 255, 255, 0.8);
        }
        @media (max-width: 480px) {
            .home-icon {
                font-size: 20px;
                top: 15px;
                left: 15px;
            }
        }

        @media print {
            .home-icon {
                display: none;
            }
        }
    </style>
</head>
<body>
   <div class="container" id="startContainer">
        <div class="header">
            <!-- Home icon added here -->
            <a href="cbse-class-9-to-12-assignment-generator.html" class="home-icon">
                <i class="fas fa-home"></i>
            </a>
            <h1>Class X Mathematics</h1>
            <p>Generate Customized Assignments</p>
        </div>
        
        <div class="content-area">
            <div id="startScreen">
                <h2 class="section-title">Math Assignment Generator</h2>
                <div class="btn-group">
                    <button class="btn btn-primary" id="startGeneratingBtn">Start Generating</button>
                </div>
            </div>

            <div id="mathOptions" class="hidden">
                <h2 class="section-title">Select Math Course</h2>
                <div class="btn-group">
                    <button class="btn btn-primary" id="selectMathBtn">Mathematics</button>
                </div>
            </div>

            <div id="chapterSelection" class="hidden">
                <h2 class="section-title">Select Chapters</h2>
                <form id="chapterForm">
                    <div class="checkbox-container">
                        <div class="checkbox-item">
                            <input type="checkbox" id="fullPaper" name="chapter" value="Full Paper">
                            <label for="fullPaper">Full Syllabus (All Chapters)</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter1" name="chapter" value="Chapter 1">
                            <label for="chapter1">1. Real Numbers</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter2" name="chapter" value="Chapter 2">
                            <label for="chapter2">2. Polynomials</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter3" name="chapter" value="Chapter 3">
                            <label for="chapter3">3. Pair of Linear Equations in Two Variables</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter4" name="chapter" value="Chapter 4">
                            <label for="chapter4">4. Quadratic Equations</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter5" name="chapter" value="Chapter 5">
                            <label for="chapter5">5. Arithmetic Progressions</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter6" name="chapter" value="Chapter 6">
                            <label for="chapter6">6. Triangles</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter7" name="chapter" value="Chapter 7">
                            <label for="chapter7">7. Coordinate Geometry</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter8" name="chapter" value="Chapter 8">
                            <label for="chapter8">8. Introduction to Trigonometry</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter9" name="chapter" value="Chapter 9">
                            <label for="chapter9">9. Some Applications of Trigonometry</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter10" name="chapter" value="Chapter 10">
                            <label for="chapter10">10. Circles</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter11" name="chapter" value="Chapter 11">
                            <label for="chapter11">11. Constructions</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter12" name="chapter" value="Chapter 12">
                            <label for="chapter12">12. Areas Related to Circles</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter13" name="chapter" value="Chapter 13">
                            <label for="chapter13">13. Surface Areas and Volumes</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter14" name="chapter" value="Chapter 14">
                            <label for="chapter14">14. Statistics</label>
                        </div>
                        <div class="checkbox-item">
                            <input type="checkbox" id="chapter15" name="chapter" value="Chapter 15">
                            <label for="chapter15">15. Probability</label>
                        </div>
                    </div>
                </form>
                <div id="message" class="hidden"></div>
                <div class="btn-group">
                    <button class="btn btn-danger" id="backToStartBtn">Back to Start</button>
                    <button class="btn btn-success" id="generateAssignmentBtn">Generate Assignment</button>
                </div>
            </div>
        </div>
    </div>

    <div class="container hidden" id="generatedPaperContainer"></div>

    <script>
        // Initialize jsPDF
        const { jsPDF } = window.jspdf;
        
        // DOM Elements
        const startContainer = document.getElementById('startContainer');
        const startScreen = document.getElementById('startScreen');
        const mathOptions = document.getElementById('mathOptions');
        const chapterSelection = document.getElementById('chapterSelection');
        const generatedPaperContainer = document.getElementById('generatedPaperContainer');
        
        // Buttons
        const startGeneratingBtn = document.getElementById('startGeneratingBtn');
        const selectMathBtn = document.getElementById('selectMathBtn');
        const backToStartBtn = document.getElementById('backToStartBtn');
        const generateAssignmentBtn = document.getElementById('generateAssignmentBtn');
        const fullPaperCheckbox = document.getElementById('fullPaper');
        const chapterCheckboxes = document.querySelectorAll('input[name="chapter"]:not(#fullPaper)');

        // Event Listeners
        startGeneratingBtn.addEventListener('click', showMathOptions);
        selectMathBtn.addEventListener('click', showChapters);
        backToStartBtn.addEventListener('click', backToStart);
        generateAssignmentBtn.addEventListener('click', generateAssignment);
        fullPaperCheckbox.addEventListener('change', toggleChapters);

        const questions = {
            "Chapter 1": {
                mcq: [
                    { question: "The decimal expansion of the rational number 37/2²×5 will terminate after:", options: ["1 decimal place", "2 decimal places", "3 decimal places", "4 decimal places"], answer: "2 decimal places" },
                    { question: "For some integer q, every odd integer is of the form:", options: ["q", "q + 1", "2q", "2q + 1"], answer: "2q + 1" },
                    { question: "The product of a non-zero rational and an irrational number is:", options: ["always irrational", "always rational", "rational or irrational", "one"], answer: "always irrational" }
                ],
                assertionReason: [
                    { 
                        assertion: "Every composite number can be expressed as a product of primes.", 
                        reason: "The Fundamental Theorem of Arithmetic states that every composite number can be factorized as a product of primes.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    },
                    { 
                        assertion: "The sum or difference of a rational and an irrational number is rational.", 
                        reason: "There is no rational number that can be added to an irrational number to make it rational.",
                        answer: "A is false but R is true."
                    }
                ],
                veryShort: [
                    "State whether 7 × 11 × 13 + 13 is a composite number or a prime number.",
                    "Find the HCF of 96 and 404 by prime factorization method."
                ],
                short: [
                    "Prove that √5 is irrational.",
                    "Explain why 7 × 11 × 13 + 13 and 7 × 6 × 5 × 4 × 3 × 2 × 1 + 5 are composite numbers."
                ],
                long: [
                    "Using Euclid's division algorithm, find the HCF of 867 and 255.",
                    "Explain the Fundamental Theorem of Arithmetic with examples."
                ],
                caseStudy: [
                    {
                        context: "A school is organizing a picnic for students. The teacher wants to divide the students into groups of equal size. When the teacher tries to divide them into groups of 15, 20, or 25, each time 8 students are left out.",
                        questions: [
                            "Find the smallest number of students that could be in the school.",
                            "If the actual number of students is 1208, how many complete groups of 25 can be formed?"
                        ]
                    }
                ]
            },
            "Chapter 2": {  
                mcq: [
                    { question: "The zeroes of the polynomial x² - 2x - 8 are:", options: ["(2, -4)", "(4, -2)", "(-2, -2)", "(4, 2)"], answer: "(4, -2)" },
                    { question: "If one zero of the quadratic polynomial x² + 3x + k is 2, then the value of k is:", options: ["10", "-10", "5", "-5"], answer: "-10" },
                    { question: "A quadratic polynomial whose zeroes are -3 and 4 is:", options: ["x² - x - 12", "x² + x - 12", "x² - x + 12", "x² + x + 12"], answer: "x² - x - 12" }
                ],
                assertionReason: [
                    { 
                        assertion: "A polynomial of degree n has at most n zeroes.", 
                        reason: "The Fundamental Theorem of Algebra states that a polynomial of degree n has exactly n roots.",
                        answer: "Both A and R are true but R is not the correct explanation of A."
                    },
                    { 
                        assertion: "The graph of a quadratic polynomial is a parabola.", 
                        reason: "The graph of any polynomial function is always a straight line.",
                        answer: "A is true but R is false."
                    }
                ],
                veryShort: [
                    "Find the zeroes of the polynomial x² - 3.",
                    "If the sum of zeroes of the quadratic polynomial 3x² - kx + 6 is 3, find the value of k."
                ],
                short: [
                    "Find a quadratic polynomial whose zeroes are 3 + √2 and 3 - √2.",
                    "Verify that 1, -1 and -3 are the zeroes of the cubic polynomial x³ + 3x² - x - 3."
                ],
                long: [
                    "Explain the relationship between zeroes and coefficients of a quadratic polynomial with an example.",
                    "Divide the polynomial p(x) = x³ - 3x² + 5x - 3 by the polynomial g(x) = x² - 2 and verify the division algorithm."
                ],
                caseStudy: [
                    {
                        context: "A farmer has a rectangular field with length represented by the polynomial expression (2x² + 5x + 3) meters and width represented by (x + 1) meters.",
                        questions: [
                            "Find the area of the field in terms of x.",
                            "If x = 10 meters, calculate the actual area of the field."
                        ]
                    }
                ]
            },
            "Chapter 3": {  
                mcq: [
                    { question: "The pair of equations x + 2y - 5 = 0 and -3x - 6y + 15 = 0 have:", options: ["a unique solution", "exactly two solutions", "infinitely many solutions", "no solution"], answer: "infinitely many solutions" },
                    { question: "The value of k for which the system of equations x + y - 4 = 0 and 2x + ky - 3 = 0 has no solution, is:", options: ["-2", "≠ 2", "2", "3"], answer: "2" },
                    { question: "The father's age is six times his son's age. Four years hence, the age of the father will be four times his son's age. The present ages of the son and the father are, respectively:", options: ["6 and 36", "7 and 42", "8 and 48", "9 and 54"], answer: "6 and 36" }
                ],
                assertionReason: [
                    { 
                        assertion: "The pair of equations 2x + 3y = 5 and 4x + 6y = 10 are consistent.", 
                        reason: "When a₁/a₂ = b₁/b₂ = c₁/c₂, the equations have infinitely many solutions.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    },
                    { 
                        assertion: "The equations 3x + 2y = 6 and 6x + 4y = 12 represent parallel lines.", 
                        reason: "Parallel lines have no solution.",
                        answer: "A is false but R is true."
                    }
                ],
                veryShort: [
                    "Find the value of k for which the pair of equations kx + 2y = 5 and 3x + y = 1 has a unique solution.",
                    "Solve the pair of equations: 2x + y = 5 and 3x + 2y = 8."
                ],
                short: [
                    "Solve the following pair of equations by substitution method: x + y = 14 and x - y = 4.",
                    "Solve the following pair of equations by elimination method: 3x + 4y = 10 and 2x - 2y = 2."
                ],
                long: [
                    "Draw the graphs of the equations x - y + 1 = 0 and 3x + 2y - 12 = 0. Determine the coordinates of the vertices of the triangle formed by these lines and the x-axis.",
                    "A fraction becomes 1/3 when 1 is subtracted from the numerator and it becomes 1/4 when 8 is added to the denominator. Find the fraction."
                ],
                caseStudy: [
                    {
                        context: "A boat goes 30 km upstream and 44 km downstream in 10 hours. In 13 hours, it can go 40 km upstream and 55 km downstream.",
                        questions: [
                            "Represent this situation algebraically.",
                            "Find the speed of the boat in still water and the speed of the stream."
                        ]
                    }
                ]
            },
            "Chapter 4": {  
                mcq: [
                    { question: "The roots of the quadratic equation x² - 3x - m(m + 3) = 0, where m is a constant, are:", options: ["m, m + 3", "-m, m + 3", "m, - (m + 3)", "-m, - (m + 3)"], answer: "-m, m + 3" },
                    { question: "The quadratic equation whose roots are 1 and 0 is:", options: ["x² - x = 0", "x² + x = 0", "x² + 1 = 0", "x² - 1 = 0"], answer: "x² - x = 0" },
                    { question: "The discriminant of the quadratic equation 3x² - 2x + 1/3 = 0 is:", options: ["0", "1", "2", "3"], answer: "0" }
                ],
                assertionReason: [
                    { 
                        assertion: "The quadratic equation x² + 4x + 5 = 0 has real roots.", 
                        reason: "A quadratic equation ax² + bx + c = 0 has real roots if b² - 4ac ≥ 0.",
                        answer: "A is false but R is true."
                    },
                    { 
                        assertion: "The roots of the equation x² - 2x - 8 = 0 are -2 and 4.", 
                        reason: "The sum of the roots is equal to the coefficient of x with sign changed.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    }
                ],
                veryShort: [
                    "Find the discriminant of the quadratic equation 2x² - 4x + 3 = 0.",
                    "Find the roots of the quadratic equation x² - 3x - 10 = 0."
                ],
                short: [
                    "Find the roots of the quadratic equation 3x² - 2√6x + 2 = 0 by factorization.",
                    "Find the values of k for which the quadratic equation 2x² + kx + 3 = 0 has equal roots."
                ],
                long: [
                    "A train travels 360 km at a uniform speed. If the speed had been 5 km/h more, it would have taken 1 hour less for the same journey. Find the speed of the train.",
                    "A rectangular park is to be designed whose breadth is 3 m less than its length. Its area is to be 4 square meters more than the area of a park that has already been made in the shape of an isosceles triangle with its base as the breadth of the rectangular park and altitude 12 m. Find the length and breadth of the rectangular park."
                ],
                caseStudy: [
                    {
                        context: "A cricket ball is thrown vertically upwards with an initial velocity of 49 m/s. The height (h) of the ball after t seconds is given by h = 49t - 4.9t².",
                        questions: [
                            "Find the time taken by the ball to return to the ground.",
                            "Find the maximum height reached by the ball."
                        ]
                    }
                ]
            },
            "Chapter 5": {  
                mcq: [
                    { question: "The 11th term of the AP: -5, -5/2, 0, 5/2, ... is:", options: ["-20", "20", "-30", "30"], answer: "20" },
                    { question: "If the 2nd term of an AP is 13 and the 5th term is 25, what is its 7th term?", options: ["30", "33", "37", "38"], answer: "33" },
                    { question: "The sum of first 16 terms of the AP: 10, 6, 2, ... is:", options: ["-320", "320", "-352", "352"], answer: "-320" }
                ],
                assertionReason: [
                    { 
                        assertion: "The sequence 3, 3 + √2, 3 + 2√2, 3 + 3√2, ... forms an AP.", 
                        reason: "The difference between consecutive terms is constant.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    },
                    { 
                        assertion: "The sum of n terms of an AP is always an even number.", 
                        reason: "The sum of n terms of an AP is given by n/2[2a + (n-1)d].",
                        answer: "A is false but R is true."
                    }
                ],
                veryShort: [
                    "Find the 10th term of the AP: 5, 1, -3, -7, ...",
                    "Find the sum of first 20 terms of the AP whose nth term is given by an = 3 + 4n."
                ],
                short: [
                    "How many terms of the AP: 9, 17, 25, ... must be taken to give a sum of 636?",
                    "Find the sum of first 24 terms of the list of numbers whose nth term is given by an = 3 + 2n."
                ],
                long: [
                    "The sum of the first n terms of an AP is given by Sn = 3n² + 2n. Find the nth term of the AP.",
                    "200 logs are stacked in the following manner: 20 logs in the bottom row, 19 in the next row, 18 in the row next to it and so on. In how many rows are the 200 logs placed and how many logs are in the top row?"
                ],
                caseStudy: [
                    {
                        context: "A child puts one rupee in her piggy bank on the first day, ₹2 on the second day, ₹3 on the third day, and so on, increasing the amount by ₹1 each day.",
                        questions: [
                            "How much money will be in the piggy bank after 30 days?",
                            "On which day will the total amount in the piggy bank first exceed ₹100?"
                        ]
                    }
                ]
            },
            "Chapter 6": {  
                mcq: [
                    { question: "If ΔABC ~ ΔQRP, ar(ABC)/ar(PQR) = 9/4, AB = 18 cm and BC = 15 cm, then PR is equal to:", options: ["10 cm", "12 cm", "20/3 cm", "8 cm"], answer: "10 cm" },
                    { question: "In ΔABC, DE || BC. If AD = 1.5 cm, BD = 3 cm and AE = 1 cm, then EC is:", options: ["1.5 cm", "2 cm", "3 cm", "4 cm"], answer: "2 cm" },
                    { question: "The lengths of the diagonals of a rhombus are 16 cm and 12 cm. Then the length of the side of the rhombus is:", options: ["9 cm", "10 cm", "8 cm", "20 cm"], answer: "10 cm" }
                ],
                assertionReason: [
                    { 
                        assertion: "All equilateral triangles are similar.", 
                        reason: "Equilateral triangles have equal corresponding angles and proportional sides.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    },
                    { 
                        assertion: "Two triangles having equal areas are congruent.", 
                        reason: "Congruent triangles have equal areas.",
                        answer: "A is false but R is true."
                    }
                ],
                veryShort: [
                    "In ΔABC, if DE || BC, AD = 4 cm, DB = 6 cm and AE = 5 cm, find EC.",
                    "The perimeters of two similar triangles ABC and PQR are 60 cm and 36 cm respectively. If PQ = 9 cm, find AB."
                ],
                short: [
                    "Prove that the ratio of the areas of two similar triangles is equal to the square of the ratio of their corresponding sides.",
                    "In ΔABC, AD is the bisector of ∠A meeting BC at D. If AB = 10 cm, AC = 6 cm and BC = 12 cm, find BD and DC."
                ],
                long: [
                    "Prove that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides.",
                    "Prove that the ratio of the areas of two similar triangles is equal to the square of the ratio of their corresponding medians."
                ],
                caseStudy: [
                    {
                        context: "A ladder 10 m long reaches a window 8 m above the ground. The ladder is moved away from the wall such that its foot moves 2 m farther from the wall.",
                        questions: [
                            "How far is the foot of the ladder from the wall initially?",
                            "How much lower does the top of the ladder reach after moving?"
                        ]
                    }
                ]
            },
            "Chapter 7": {  
                mcq: [
                    { question: "The distance between the points A(0, 6) and B(0, -2) is:", options: ["6", "8", "4", "2"], answer: "8" },
                    { question: "The distance of the point P(-6, 8) from the origin is:", options: ["8", "2√7", "10", "6"], answer: "10" },
                    { question: "The points (-4, 0), (4, 0), (0, 3) are the vertices of a:", options: ["right triangle", "isosceles triangle", "equilateral triangle", "scalene triangle"], answer: "isosceles triangle" }
                ],
                assertionReason: [
                    { 
                        assertion: "The points (1, -1), (5, 2) and (9, 5) are collinear.", 
                        reason: "Three points are collinear if the area of the triangle formed by them is zero.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    },
                    { 
                        assertion: "The point (2, 3) lies in the first quadrant.", 
                        reason: "A point (x, y) lies in the first quadrant if both x and y are positive.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    }
                ],
                veryShort: [
                    "Find the distance between the points (2, 3) and (4, 1).",
                    "Find the coordinates of the midpoint of the line segment joining the points (4, 3) and (-2, 7)."
                ],
                short: [
                    "Find the ratio in which the line segment joining the points (-3, 10) and (6, -8) is divided by (-1, 6).",
                    "Find the area of the triangle formed by the points (2, 3), (-1, 0) and (2, -4)."
                ],
                long: [
                    "Find the coordinates of the points of trisection of the line segment joining (4, -1) and (-2, -3).",
                    "Find the area of the quadrilateral whose vertices, taken in order, are (-4, -2), (-3, -5), (3, -2) and (2, 3)."
                ],
                caseStudy: [
                    {
                        context: "A farmer has a triangular field with vertices at P(1, -1), Q(-4, 6) and R(-3, -5). He wants to divide the field into two parts of equal area by building a straight fence from vertex P to a point S on QR.",
                        questions: [
                            "Find the coordinates of point S.",
                            "Calculate the length of the fence PS."
                        ]
                    }
                ]
            },
            "Chapter 8": {  
                mcq: [
                    { question: "If sin A = 3/4, then cos A is:", options: ["4/3", "√7/4", "3/4", "1/4"], answer: "√7/4" },
                    { question: "If cot θ = 7/8, then (1 + sin θ)(1 - sin θ)/(1 + cos θ)(1 - cos θ) =", options: ["49/64", "64/49", "7/8", "8/7"], answer: "49/64" },
                    { question: "If x = a sec θ and y = b tan θ, then the value of x²/a² - y²/b² is:", options: ["0", "1", "-1", "2"], answer: "1" }
                ],
                assertionReason: [
                    { 
                        assertion: "sin (90° - θ) = cos θ.", 
                        reason: "The sine of an angle is equal to the cosine of its complement.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    },
                    { 
                        assertion: "1 + tan²θ = sec²θ for all values of θ.", 
                        reason: "This is one of the fundamental trigonometric identities.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    }
                ],
                veryShort: [
                    "If tan A = cot B, prove that A + B = 90°.",
                    "Express sin 67° + cos 75° in terms of trigonometric ratios of angles between 0° and 45°."
                ],
                short: [
                    "Prove that: (1 + cot²A)(1 - cos A)(1 + cos A) = 1",
                    "Prove that: (sin θ + cosec θ)² + (cos θ + sec θ)² = 7 + tan²θ + cot²θ"
                ],
                long: [
                    "Prove that: (cosec A - sin A)(sec A - cos A) = 1/(tan A + cot A)",
                    "Prove that: (1 + cot A + tan A)(sin A - cos A) = sec A/cosec²A - cosec A/sec²A"
                ],
                caseStudy: [
                    {
                        context: "A ladder leaning against a vertical wall makes an angle of 60° with the ground. The foot of the ladder is 2 m away from the wall.",
                        questions: [
                            "Find the length of the ladder.",
                            "Find the height at which the ladder touches the wall."
                        ]
                    }
                ]
            },
            "Chapter 9": {  
                mcq: [
                    { question: "The angle of elevation of the top of a tower from a point 20 m away from its base is 45°. The height of the tower is:", options: ["10 m", "20 m", "30 m", "20√3 m"], answer: "20 m" },
                    { question: "The shadow of a tower standing on level ground is found to be 40 m longer when the Sun's altitude is 30° than when it is 60°. The height of the tower is:", options: ["10√3 m", "20√3 m", "30√3 m", "40√3 m"], answer: "20√3 m" },
                    { question: "If the length of the shadow of a tower is increasing, then the angle of elevation of the Sun is:", options: ["increasing", "decreasing", "remaining unchanged", "can't say"], answer: "decreasing" }
                ],
                assertionReason: [
                    { 
                        assertion: "The angle of elevation of an object seen by an observer is the angle between the horizontal and the line from the object to the observer's eye.", 
                        reason: "The angle of elevation is measured upward from the horizontal.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    },
                    { 
                        assertion: "For the same height, as the distance from the object increases, the angle of elevation decreases.", 
                        reason: "The angle of elevation is inversely proportional to the distance from the object.",
                        answer: "Both A and R are true but R is not the correct explanation of A."
                    }
                ],
                veryShort: [
                    "The angle of elevation of the top of a tower from a point on the ground is 30°. If the height of the tower is 40 m, find the distance of the point from the foot of the tower.",
                    "A ladder 15 m long just reaches the top of a vertical wall. If the ladder makes an angle of 60° with the wall, find the height of the wall."
                ],
                short: [
                    "A kite is flying at a height of 60 m above the ground. The string attached to the kite is temporarily tied to a point on the ground. The inclination of the string with the ground is 60°. Find the length of the string.",
                    "The angle of elevation of the top of a building from the foot of a tower is 30° and the angle of elevation of the top of the tower from the foot of the building is 60°. If the tower is 50 m high, find the height of the building."
                ],
                long: [
                    "From the top of a 7 m high building, the angle of elevation of the top of a cable tower is 60° and the angle of depression of its foot is 45°. Determine the height of the tower.",
                    "Two poles of equal heights are standing opposite each other on either side of the road, which is 80 m wide. From a point between them on the road, the angles of elevation of the top of the poles are 60° and 30° respectively. Find the height of the poles and the distances of the point from the poles."
                ],
                caseStudy: [
                    {
                        context: "A TV tower stands vertically on a bank of a canal. From a point on the other bank directly opposite the tower, the angle of elevation of the top of the tower is 60°. From another point 20 m away from this point on the line joining this point to the foot of the tower, the angle of elevation of the top of the tower is 30°.",
                        questions: [
                            "Find the height of the tower.",
                            "Find the width of the canal."
                        ]
                    }
                ]
            },
            "Chapter 10": {  
                mcq: [
                    { question: "The length of a tangent from a point A at distance 5 cm from the center of the circle is 4 cm. The radius of the circle is:", options: ["3 cm", "4 cm", "5 cm", "6 cm"], answer: "3 cm" },
                    { question: "In the figure, if TP and TQ are the two tangents to a circle with center O so that ∠POQ = 110°, then ∠PTQ is equal to:", options: ["60°", "70°", "80°", "90°"], answer: "70°" },
                    { question: "If tangents PA and PB from a point P to a circle with center O are inclined to each other at angle of 80°, then ∠POA is equal to:", options: ["50°", "60°", "70°", "80°"], answer: "50°" }
                ],
                assertionReason: [
                    { 
                        assertion: "The lengths of tangents drawn from an external point to a circle are equal.", 
                        reason: "The tangents are congruent triangles with the circle.",
                        answer: "Both A and R are true but R is not the correct explanation of A."
                    },
                    { 
                        assertion: "A line drawn through the end point of a radius and perpendicular to it is a tangent to the circle.", 
                        reason: "The tangent at any point of a circle is perpendicular to the radius through the point of contact.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    }
                ],
                veryShort: [
                    "From a point Q, the length of the tangent to a circle is 24 cm and the distance of Q from the center is 25 cm. Find the radius of the circle.",
                    "Prove that the tangents drawn at the ends of a diameter of a circle are parallel."
                ],
                short: [
                    "Prove that the parallelogram circumscribing a circle is a rhombus.",
                    "Prove that the angle between the two tangents drawn from an external point to a circle is supplementary to the angle subtended by the line segment joining the points of contact at the center."
                ],
                long: [
                    "Prove that the lengths of tangents drawn from an external point to a circle are equal.",
                    "Prove that the opposite sides of a quadrilateral circumscribing a circle subtend supplementary angles at the center of the circle."
                ],
                caseStudy: [
                    {
                        context: "A circular park of radius 20 m is situated in a colony. Three boys Ankur, Syed and David are sitting at equal distance on its boundary each having a toy telephone in his hands to talk each other.",
                        questions: [
                            "Find the length of the string of each phone.",
                            "What is the angle subtended by the string at the center of the park for each pair?"
                        ]
                    }
                ]
            },
            "Chapter 11": {  
                mcq: [
                    { question: "To divide a line segment AB in the ratio 5:7, first a ray AX is drawn so that ∠BAX is an acute angle and then at equal distances points are marked on the ray AX such that the minimum number of these points is:", options: ["8", "10", "11", "12"], answer: "12" },
                    { question: "To construct a triangle similar to a given ΔABC with its sides 3/7 of the corresponding sides of ΔABC, first draw a ray BX such that ∠CBX is an acute angle and X lies on the opposite side of A with respect to BC. Then locate points B₁, B₂, B₃, ... on BX at equal distances and next step is to join:", options: ["B₇ to C", "B₃ to C", "B₄ to C", "B₁ to C"], answer: "B₇ to C" },
                    { question: "To draw a pair of tangents to a circle which are inclined to each other at an angle of 60°, it is required to draw tangents at end points of those two radii of the circle, the angle between them should be:", options: ["60°", "90°", "120°", "130°"], answer: "120°" }
                ],
                assertionReason: [
                    { 
                        assertion: "The division of a line segment in a given ratio can be done using basic proportionality theorem.", 
                        reason: "Basic proportionality theorem states that if a line is drawn parallel to one side of a triangle to intersect the other two sides in distinct points, the other two sides are divided in the same ratio.",
                        answer: "Both A and R are true but R is not the correct explanation of A."
                    },
                    { 
                        assertion: "The construction of a tangent to a circle at a given point on it requires drawing a perpendicular to the radius at that point.", 
                        reason: "The tangent at any point of a circle is perpendicular to the radius through the point of contact.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    }
                ],
                veryShort: [
                    "Draw a line segment of length 7.6 cm and divide it in the ratio 5:8.",
                    "Construct a tangent to a circle of radius 4 cm from a point on the concentric circle of radius 6 cm."
                ],
                short: [
                    "Construct a triangle with sides 5 cm, 6 cm and 7 cm and then another triangle whose sides are 7/5 of the corresponding sides of the first triangle.",
                    "Draw a right triangle in which the sides (other than hypotenuse) are of lengths 4 cm and 3 cm. Then construct another triangle whose sides are 5/3 times the corresponding sides of the given triangle."
                ],
                long: [
                    "Construct an isosceles triangle whose base is 8 cm and altitude 4 cm and then another triangle whose sides are 1.5 times the corresponding sides of the isosceles triangle.",
                    "Draw a circle of radius 6 cm. From a point 10 cm away from its center, construct the pair of tangents to the circle and measure their lengths."
                ],
                caseStudy: [
                    {
                        context: "A farmer has a triangular field with sides 120 m, 80 m and 50 m. He wants to divide the field into two parts of equal area by constructing a fence parallel to the longest side.",
                        questions: [
                            "Find the length of the fence required.",
                            "Calculate the distance of the fence from the longest side."
                        ]
                    }
                ]
            },
            "Chapter 12": {  
                mcq: [
                    { question: "If the perimeter and the area of a circle are numerically equal, then the radius of the circle is:", options: ["2 units", "π units", "4 units", "7 units"], answer: "2 units" },
                    { question: "The area of a sector of angle θ (in degrees) of a circle with radius R is:", options: ["θ/180 × πR²", "θ/360 × πR²", "θ/720 × πR²", "θ/90 × πR²"], answer: "θ/360 × πR²" },
                    { question: "The area of the largest triangle that can be inscribed in a semicircle of radius r is:", options: ["r²", "2r²", "√2 r²", "1/2 r²"], answer: "r²" }
                ],
                assertionReason: [
                    { 
                        assertion: "The circumference of a circle is equal to the perimeter of a square. Then the area of the circle is greater than the area of the square.", 
                        reason: "For a given perimeter, the circle has the maximum area among all shapes.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    },
                    { 
                        assertion: "If the radius of a circle is doubled, its area becomes four times.", 
                        reason: "Area of a circle is directly proportional to the square of its radius.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    }
                ],
                veryShort: [
                    "Find the area of a sector of a circle with radius 6 cm if angle of the sector is 60°.",
                    "Find the area of the shaded region where ABCD is a square of side 14 cm and four semicircles are drawn with each side of the square as diameter."
                ],
                short: [
                    "Find the area of the shaded region in the figure, where a circular arc of radius 6 cm has been drawn with vertex O of an equilateral triangle OAB of side 12 cm as center.",
                    "In the figure, ABC is a quadrant of a circle of radius 14 cm and a semicircle is drawn with BC as diameter. Find the area of the shaded region."
                ],
                long: [
                    "Find the area of the shaded region in the figure, where ABCD is a square of side 14 cm and four circles of equal radii are drawn with centers at A, B, C and D.",
                    "In the figure, O is the center of the circle with AC = 24 cm, AB = 7 cm and ∠BOD = 90°. Find the area of the shaded region."
                ],
                caseStudy: [
                    {
                        context: "A horse is tied to a peg at one corner of a square shaped grass field of side 15 m by means of a 5 m long rope.",
                        questions: [
                            "Find the area of that part of the field in which the horse can graze.",
                            "Find the increase in the grazing area if the rope were 10 m long instead of 5 m."
                        ]
                    }
                ]
            },
            "Chapter 13": {  
                mcq: [
                    { question: "A cylindrical pencil sharpened at one edge is the combination of:", options: ["a cone and a cylinder", "frustum of a cone and a cylinder", "a hemisphere and a cylinder", "two cylinders"], answer: "a cone and a cylinder" },
                    { question: "A shuttlecock used for playing badminton has the shape of the combination of:", options: ["a cylinder and a sphere", "a cylinder and a hemisphere", "a frustum of a cone and a hemisphere", "a cone and a sphere"], answer: "a frustum of a cone and a hemisphere" },
                    { question: "The volume of the largest right circular cone that can be fitted in a cube whose edge is 2r is:", options: ["1/3 πr³", "2/3 πr³", "4/3 πr³", "8/3 πr³"], answer: "2/3 πr³" }
                ],
                assertionReason: [
                    { 
                        assertion: "The volume of a sphere is equal to two-third of the volume of a cylinder whose height and diameter are equal to the diameter of the sphere.", 
                        reason: "The volume of a sphere is 4/3 πr³ and that of the described cylinder is 2πr³.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    },
                    { 
                        assertion: "If the radius of a sphere is doubled, its surface area becomes four times.", 
                        reason: "Surface area of a sphere is directly proportional to the square of its radius.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    }
                ],
                veryShort: [
                    "A cone, a hemisphere and a cylinder stand on equal bases and have the same height. Find the ratio of their volumes.",
                    "Find the volume of a sphere whose surface area is 154 cm²."
                ],
                short: [
                    "A hemispherical tank is made up of an iron sheet 1 cm thick. If the inner radius is 1 m, then find the volume of the iron used to make the tank.",
                    "A medicine capsule is in the shape of a cylinder with two hemispheres stuck to each of its ends. The length of the entire capsule is 14 mm and the diameter of the capsule is 5 mm. Find its surface area."
                ],
                long: [
                    "A solid is in the shape of a cone standing on a hemisphere with both their radii being equal to 1 cm and the height of the cone is equal to its radius. Find the volume of the solid in terms of π.",
                    "A gulab jamun contains sugar syrup up to about 30% of its volume. Find approximately how much syrup would be found in 45 gulab jamuns, each shaped like a cylinder with two hemispherical ends with length 5 cm and diameter 2.8 cm."
                ],
                caseStudy: [
                    {
                        context: "A container shaped like a right circular cylinder having diameter 12 cm and height 15 cm is full of ice cream. The ice cream is to be filled into cones of height 12 cm and diameter 6 cm, having a hemispherical shape on the top.",
                        questions: [
                            "Find the number of such cones which can be filled with ice cream.",
                            "Find the volume of ice cream left in the cylinder after filling the cones."
                        ]
                    }
                ]
            },
            "Chapter 14": {  
                mcq: [
                    { question: "The mean of the first five prime numbers is:", options: ["5.0", "5.2", "5.6", "6.0"], answer: "5.6" },
                    { question: "The median of the data 13, 15, 16, 17, 19, 20 is:", options: ["16", "16.5", "17", "17.5"], answer: "16.5" },
                    { question: "The mode of the data 2, 3, 9, 16, 9, 3, 9 is:", options: ["3", "7", "9", "16"], answer: "9" }
                ],
                assertionReason: [
                    { 
                        assertion: "The mean of the first n natural numbers is (n+1)/2.", 
                        reason: "The sum of the first n natural numbers is n(n+1)/2.",
                        answer: "A is false but R is true."
                    },
                    { 
                        assertion: "For a symmetrical distribution, mean, median and mode are equal.", 
                        reason: "In a symmetrical distribution, all measures of central tendency coincide.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    }
                ],
                veryShort: [
                    "Find the mean of the first 10 odd natural numbers.",
                    "Find the mode of the data: 14, 25, 14, 28, 18, 17, 18, 14, 23, 22, 14, 18."
                ],
                short: [
                    "The following observations have been arranged in ascending order. If the median of the data is 63, find the value of x: 29, 32, 48, 50, x, x+2, 72, 78, 84, 95",
                    "Find the mean salary of 60 workers of a factory from the following table:\nSalary (in ₹) | Number of workers\n3000 | 16\n4000 | 12\n5000 | 10\n6000 | 8\n7000 | 6\n8000 | 4\n9000 | 4"
                ],
                long: [
                    "The following table gives the literacy rate (in percentage) of 35 cities. Find the mean literacy rate:\nLiteracy rate (in %) | Number of cities\n45-55 | 3\n55-65 | 10\n65-75 | 11\n75-85 | 8\n85-95 | 3",
                    "The following distribution shows the daily pocket allowance of children of a locality. The mean pocket allowance is ₹18. Find the missing frequency f:\nPocket allowance (in ₹) | Number of children\n11-13 | 7\n13-15 | 6\n15-17 | 9\n17-19 | 13\n19-21 | f\n21-23 | 5\n23-25 | 4"
                ],
                caseStudy: [
                    {
                        context: "A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality.",
                        questions: [
                            "Find the mean number of plants per house.",
                            "Find the median number of plants."
                        ]
                    }
                ]
            },
            "Chapter 15": {  
                mcq: [
                    { question: "The probability of getting a prime number when a die is rolled once is:", options: ["1/2", "1/3", "1/4", "1/6"], answer: "1/2" },
                    { question: "A card is drawn from a well-shuffled deck of 52 cards. The probability of getting a red face card is:", options: ["3/26", "1/13", "1/52", "1/4"], answer: "3/26" },
                    { question: "The probability that a non-leap year has 53 Sundays is:", options: ["0", "1/7", "2/7", "3/7"], answer: "1/7" }
                ],
                assertionReason: [
                    { 
                        assertion: "The probability of an event cannot be negative.", 
                        reason: "Probability values always lie between 0 and 1.",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    },
                    { 
                        assertion: "If P(E) = 0.05, then the probability of 'not E' is 0.95.", 
                        reason: "P(E) + P(not E) = 1",
                        answer: "Both A and R are true and R is the correct explanation of A."
                    }
                ],
                veryShort: [
                    "A die is thrown once. Find the probability of getting a number greater than 4.",
                    "A card is drawn at random from a pack of 52 playing cards. Find the probability that the card drawn is neither a red card nor a queen."
                ],
                short: [
                    "A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, determine the number of blue balls in the bag.",
                    "A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, find the probability that it bears (i) a two-digit number (ii) a perfect square number."
                ],
                long: [
                    "A game consists of tossing a one rupee coin 3 times and noting its outcome each time. Hanif wins if all the tosses give the same result (i.e., three heads or three tails) and loses otherwise. Calculate the probability that Hanif will lose the game.",
                    "A die is thrown twice. What is the probability that (i) 5 will not come up either time? (ii) 5 will come up at least once?"
                ],
                caseStudy: [
                    {
                        context: "In a musical chair game, the person playing the music has been advised to stop playing the music at any time within 2 minutes after she starts playing. The probability that the music will stop within the first half-minute is 0.15.",
                        questions: [
                            "What is the probability that the music will stop after half minute but before 1 minute?",
                            "What is the probability that the music will continue to play beyond 1.5 minutes?"
                        ]
                    }
                ]
            }
        };

        function getRandomQuestions(chapters, type, count) {
            try {
                let allQuestions = [];
                chapters.forEach(chapter => {
                    if (questions[chapter] && questions[chapter][type]) {
                        allQuestions = allQuestions.concat(questions[chapter][type]);
                    }
                });
                allQuestions = allQuestions.sort(() => Math.random() - 0.5);
                return allQuestions.slice(0, count);
            } catch (error) {
                console.error("Error in getRandomQuestions:", error);
                return [];
            }
        }

        function showMathOptions() {
            startScreen.classList.add('hidden');
            mathOptions.classList.remove('hidden');
        }

        function showChapters() {
            mathOptions.classList.add('hidden');
            chapterSelection.classList.remove('hidden');
        }

        function toggleChapters() {
            chapterCheckboxes.forEach(cb => cb.disabled = fullPaperCheckbox.checked);
        }

        function backToStart() {
            generatedPaperContainer.classList.add('hidden');
            startContainer.classList.remove('hidden');
            chapterSelection.classList.add('hidden');
            startScreen.classList.remove('hidden');
        }

        function generateAssignment() {
            try {
                console.log("Generating assignment...");
                
                // Hide start container and show assignment container
                startContainer.classList.add('hidden');
                generatedPaperContainer.classList.remove('hidden');
                generatedPaperContainer.innerHTML = '';
                
                // Get selected chapters
                const selectedChapters = fullPaperCheckbox.checked 
                    ? Object.keys(questions) 
                    : Array.from(document.querySelectorAll('input[name="chapter"]:checked')).map(cb => cb.value);

                if (selectedChapters.length === 0) {
                    alert("Please select at least one chapter!");
                    startContainer.classList.remove('hidden');
                    return;
                }

                console.log("Selected chapters:", selectedChapters);

                const chapterNames = selectedChapters.map(ch => {
                    if (ch === "Full Paper") return "Full Syllabus";
                    const label = document.querySelector(`label[for="${ch.toLowerCase()}"]`);
                    return label ? ch + ". " + label.textContent.split(". ")[1] : ch;
                }).join(", ");

                console.log("Chapter names:", chapterNames);

                // Create assignment content
                let paperContent = `
                    <div class="header">
                        <h2>Class X Mathematics Assignment</h2>
                        <h3>${selectedChapters.length === Object.keys(questions).length ? "Full Syllabus" : chapterNames}</h3>
                    </div>
                    <div class="content-area">
                        <div class="instructions">
                            <p><strong>General Instructions:</strong></p>
                            <ol>
                                <li>Complete all questions in your math notebook.</li>
                                <li>Show all your workings clearly.</li>
                                <li>Draw diagrams wherever necessary.</li>
                                <li>Submit the assignment by the due date.</li>
                                <li>Use blue or black ink only.</li>
                            </ol>
                        </div>
                `;

                // Get random questions
                const mcqs = getRandomQuestions(selectedChapters, 'mcq', 10);
                const assertionReasons = getRandomQuestions(selectedChapters, 'assertionReason', 5);
                const veryShort = getRandomQuestions(selectedChapters, 'veryShort', 5);
                const short = getRandomQuestions(selectedChapters, 'short', 5);
                const long = getRandomQuestions(selectedChapters, 'long', 5);
                const caseStudies = getRandomQuestions(selectedChapters, 'caseStudy', 2);

                console.log("Questions retrieved:", {
                    mcqs, assertionReasons, veryShort, short, long, caseStudies
                });

                let questionNumber = 1;
                
                // Section A - MCQ
                paperContent += `
                    <div class="question-section">
                        <h4 class="section-heading">Section A - Multiple Choice Questions (1 mark each)</h4>
                        <p>Choose the correct option for each question:</p>
                `;
                mcqs.forEach(mcq => {
                    paperContent += `
                        <div class="question">
                            <p class="question-text">${questionNumber++}. ${mcq.question}</p>
                            ${mcq.options.map((opt, idx) => 
                                `<p class="option">${String.fromCharCode(65 + idx)}. ${opt}</p>`
                            ).join('')}
                        </div>
                    `;
                });
                
                // Section B - Assertion Reason
                paperContent += `
                    </div>
                    <div class="question-section">
                        <h4 class="section-heading">Section B - Assertion Reason Questions (1 mark each)</h4>
                        <p>For each question, choose the correct option:</p>
                `;
                assertionReasons.forEach(ar => {
                    paperContent += `
                        <div class="question">
                            <p class="question-text">${questionNumber++}. <strong>Assertion (A):</strong> ${ar.assertion}</p>
                            <p class="assertion-reason"><strong>Reason (R):</strong> ${ar.reason}</p>
                            <p class="option">Options:</p>
                            <p class="option">A. Both A and R are true and R is the correct explanation of A.</p>
                            <p class="option">B. Both A and R are true but R is not the correct explanation of A.</p>
                            <p class="option">C. A is true but R is false.</p>
                            <p class="option">D. A is false but R is true.</p>
                        </div>
                    `;
                });
                
                // Section C - Very Short Questions
                paperContent += `
                    </div>
                    <div class="question-section">
                        <h4 class="section-heading">Section C - Very Short Answer Questions (2 marks each)</h4>
                `;
                veryShort.forEach(q => {
                    paperContent += `
                        <div class="question">
                            <p class="question-text">${questionNumber++}. ${q}</p>
                        </div>
                    `;
                });
                
                // Section D - Short Questions
                paperContent += `
                    </div>
                    <div class="question-section">
                        <h4 class="section-heading">Section D - Short Answer Questions (3 marks each)</h4>
                `;
                short.forEach(q => {
                    paperContent += `
                        <div class="question">
                            <p class="question-text">${questionNumber++}. ${q}</p>
                        </div>
                    `;
                });
                
                // Section E - Long Questions
                paperContent += `
                    </div>
                    <div class="question-section">
                        <h4 class="section-heading">Section E - Long Answer Questions (5 marks each)</h4>
                `;
                long.forEach(q => {
                    paperContent += `
                        <div class="question">
                            <p class="question-text">${questionNumber++}. ${q}</p>
                        </div>
                    `;
                });
                
                // Section F - Case Study Questions
                paperContent += `
                    </div>
                    <div class="question-section">
                        <h4 class="section-heading">Section F - Case Study Based Questions (4 marks each)</h4>
                        <p><em>Each case study has 2 questions of 2 marks each.</em></p>
                `;
                caseStudies.forEach((cs, index) => {
                    paperContent += `
                        <div class="case-study">
                            <p><strong>Case Study ${index + 1}:</strong> ${cs.context}</p>
                            ${cs.questions.map((q, qIndex) => 
                                `<div class="case-study-question">
                                    <p class="question-text">${questionNumber++}. ${q}</p>
                                </div>`
                            ).join('')}
                        </div>
                    `;
                });
                
                // Add buttons below the generated paper
                paperContent += `
                        </div>
                        <div class="action-buttons">
                            <button class="btn btn-primary" onclick="downloadPDF()">Download as PDF</button>
                            <button class="btn btn-success" onclick="window.print()">Print</button>
                            <button class="btn btn-danger" onclick="backToStart()">Back to Start</button>
                        </div>
                    </div>
                `;

                console.log("Final paper content generated");
                generatedPaperContainer.innerHTML = paperContent;
                console.log("Assignment generated successfully");

            } catch (error) {
                console.error("Error generating assignment:", error);
                alert("An error occurred while generating the assignment. Please check the console for details.");
                backToStart();
            }
        }

        async function downloadPDF() {
            const element = document.getElementById('generatedPaperContainer');
            
            // Create a temporary div with optimized settings
            const tempDiv = document.createElement('div');
            tempDiv.style.position = 'absolute';
            tempDiv.style.left = '-9999px';
            tempDiv.style.width = '794px'; // A4 width in pixels (210mm)
            tempDiv.style.backgroundColor = 'white';
            tempDiv.style.padding = '20px';
            tempDiv.innerHTML = element.innerHTML;
            document.body.appendChild(tempDiv);

            try {
                const pdf = new jsPDF('p', 'mm', 'a4');
                const pageWidth = pdf.internal.pageSize.getWidth() - 25.4; // 0.5" margins
                const pageHeight = pdf.internal.pageSize.getHeight() - 25.4;
                
                // Split content into pages
                let position = 12.7; // Start with 0.5" top margin
                let remainingHeight = tempDiv.scrollHeight;
                let pageNum = 1;
                
                while (remainingHeight > 0) {
                    // Capture the current page section
                    const canvas = await html2canvas(tempDiv, {
                        scale: 2,
                        windowHeight: pageHeight * 3.78, // mm to px
                        windowWidth: pageWidth * 3.78,
                        y: position * 3.78, // mm to px
                        height: pageHeight * 3.78,
                        useCORS: true,
                        backgroundColor: '#ffffff',
                        logging: false
                    });

                    const imgData = canvas.toDataURL('image/jpeg', 0.92);
                    
                    // Add page to PDF
                    if (pageNum > 1) {
                        pdf.addPage('a4', 'portrait');
                    }
                    
                    pdf.addImage(imgData, 'JPEG', 12.7, 12.7, pageWidth, canvas.height * pageWidth / canvas.width);
                    
                    position += pageHeight;
                    remainingHeight -= pageHeight * 3.78; // px
                    pageNum++;
                }

                // Save PDF
                pdf.save('Class_10_Math_Assignment.pdf');
                console.log("PDF saved successfully");
                
            } catch (error) {
                console.error('PDF generation error:', error);
                alert('Error generating PDF. Please check the console for details.');
                // Remove temporary div if it exists
                const tempDiv = document.querySelector('.temp-pdf-container');
                if (tempDiv) {
                    document.body.removeChild(tempDiv);
                }
            }
        }
    </script>
</body>
</html>