Function Machine Addition Expert — Set 45

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                "rule": "×2 + 3",
                "input": 6,
                "output": 15,
                "question": "Input: 6 → [?] → 15, what is the rule?",
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                "rule": "+4 ×2",
                "input": 6,
                "output": 20,
                "question": "Input: 6 → [?] → 20, what is the rule?",
                "answer": "+4 ×2",
                "correctAnswer": "+4 ×2",
                "difficulty": "expert"
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                "id": 5,
                "type": "function-machine",
                "subType": "find-rule",
                "rule": "-1",
                "input": 9,
                "output": 8,
                "question": "Input: 9 → [?] → 8, what is the rule?",
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                "correctAnswer": "-1",
                "difficulty": "expert"
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                "id": 6,
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                "input": 10,
                "output": 23,
                "question": "Input: 10 → [?] → 23, what is the rule?",
                "answer": "×2 + 3",
                "correctAnswer": "×2 + 3",
                "difficulty": "expert"
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                "id": 7,
                "type": "function-machine",
                "subType": "find-rule",
                "rule": "×5",
                "input": 10,
                "output": 50,
                "question": "Input: 10 → [?] → 50, what is the rule?",
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                "correctAnswer": "×5",
                "difficulty": "expert"
            },
            {
                "id": 8,
                "type": "function-machine",
                "subType": "find-output",
                "rule": "+2",
                "input": 8,
                "output": 10,
                "question": "Input: 8 → [+2] → ?",
                "answer": 10,
                "correctAnswer": "10",
                "difficulty": "expert"
            }
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