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    Question

    Select the number that can replace the question mark

    (?) in the following series. 12, 21, 5, 30, -6, 43, ?
    A 25 Correct Answer Incorrect Answer
    B -21 Correct Answer Incorrect Answer
    C 16 Correct Answer Incorrect Answer
    D -13 Correct Answer Incorrect Answer

    Solution

    12 + 3² = 12 + 9 = 21 21 - 4² = 21 – 16 = 5 5 + 5² = 5 + 25 = 30 30 - 6² = 30 – 36 = - 6   -6 + 7² = -6 + 49 = 43 43 - 8² =   43 – 64 = -21

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