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    Question

    Select the number from the given option that can

    replace the question mark (?) in the following series. 15, 24, 35, 48, 63, ? 
    A 80 Correct Answer Incorrect Answer
    B 99 Correct Answer Incorrect Answer
    C 81 Correct Answer Incorrect Answer
    D 64 Correct Answer Incorrect Answer

    Solution

    The logic followed here is as follows, 4² – 1 = 16 – 1 = 15 5² – 1 = 25 – 1 = 24 6² – 1 = 36 – 1 = 35 7² – 1 = 49 – 1 = 48 8² – 1 = 64 – 1 = 63 9² – 1 = 81 – 1 = 80 So, ‘80’ will replace the question mark in the given series.

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