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    Question

    12 23 65 ? 1239

    7409
    A 215 Correct Answer Incorrect Answer
    B 249 Correct Answer Incorrect Answer
    C 251 Correct Answer Incorrect Answer
    D 151 Correct Answer Incorrect Answer
    E 185 Correct Answer Incorrect Answer

    Solution

    12 × 2 - 1² = 23 23 × 3 - 2² = 65 65 × 4 - 3² = 251 251 × 5 - 4² = 1239 1239 × 6 - 5² = 7409

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