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    Question

    Select the number that will replace the question mark

    (?) in the following series. 31, 34, 39, 46, 57, 70, ?
    A 87 Correct Answer Incorrect Answer
    B 89 Correct Answer Incorrect Answer
    C 85 Correct Answer Incorrect Answer
    D 81 Correct Answer Incorrect Answer

    Solution

    31 + 3 = 34 34 + 5 = 39 39 + 7 = 46 46 + 11 = 57 57 + 13 = 70 70 + 17 = 87

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