Function Machine Mixed Ops Medium — Set 50

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        "operation": "function-machine",
        "subject": "arithmetic",
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                "rule": "×2 + 1",
                "input": 5,
                "output": 11,
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                "rule": "×2 + 3",
                "input": 9,
                "output": 21,
                "question": "Input: 9 → [?] → 21, what is the rule?",
                "answer": "×2 + 3",
                "correctAnswer": "×2 + 3",
                "difficulty": "medium"
            },
            {
                "id": 3,
                "type": "function-machine",
                "subType": "find-input",
                "rule": "+10",
                "input": 2,
                "output": 12,
                "question": "? → [+10] → 12",
                "answer": 2,
                "correctAnswer": "2",
                "difficulty": "medium"
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                "id": 4,
                "type": "function-machine",
                "subType": "find-rule",
                "rule": "-1",
                "input": 9,
                "output": 8,
                "question": "Input: 9 → [?] → 8, what is the rule?",
                "answer": "-1",
                "correctAnswer": "-1",
                "difficulty": "medium"
            },
            {
                "id": 5,
                "type": "function-machine",
                "subType": "find-output",
                "rule": "×5",
                "input": 2,
                "output": 10,
                "question": "Input: 2 → [×5] → ?",
                "answer": 10,
                "correctAnswer": "10",
                "difficulty": "medium"
            },
            {
                "id": 6,
                "type": "function-machine",
                "subType": "find-rule",
                "rule": "-3",
                "input": 5,
                "output": 2,
                "question": "Input: 5 → [?] → 2, what is the rule?",
                "answer": "-3",
                "correctAnswer": "-3",
                "difficulty": "medium"
            },
            {
                "id": 7,
                "type": "function-machine",
                "subType": "find-rule",
                "rule": "+10",
                "input": 4,
                "output": 14,
                "question": "Input: 4 → [?] → 14, what is the rule?",
                "answer": "+10",
                "correctAnswer": "+10",
                "difficulty": "medium"
            },
            {
                "id": 8,
                "type": "function-machine",
                "subType": "find-rule",
                "rule": "+4 ×2",
                "input": 4,
                "output": 16,
                "question": "Input: 4 → [?] → 16, what is the rule?",
                "answer": "+4 ×2",
                "correctAnswer": "+4 ×2",
                "difficulty": "medium"
            }
        ],
        "layout": {
            "columns": 2,
            "problemsPerPage": 20
        }
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    "outputTargets": {
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    "_archetype": "form-exercise",
    "_generatorId": "arithmetic-generator-v7.2.1"
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