easy 3×3 Set 2 Unknown

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    "title": "form-exercise set 2",
    "operation": "math-bingo",
    "subject": "arithmetic",
    "difficulty": "easy",
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            "type": "math-bingo",
            "card": [
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                    {
                        "value": 24,
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                    {
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                    "problem": "15 + 15",
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                {
                    "problem": "21 - 6",
                    "answer": 15
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                {
                    "problem": "5 × 5",
                    "answer": 25
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                {
                    "problem": "3 + 6",
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                {
                    "problem": "2 + 2",
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                    "problem": "13 - 3",
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                    "problem": "7 × 3",
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                    "problem": "2 + 3",
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                {
                    "problem": "3 × 6",
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                    "problem": "9 + 11",
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                    "problem": "35 - 9",
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            "freeCenter": true,
            "question": "Mark answers on your bingo card as problems are called.",
            "correctAnswer": "bingo"
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