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    Question

    What should come in place of the question mark (?) in the following number series:

    26 63 124 215 342 511

    ?
    A 610 Correct Answer Incorrect Answer
    B 728 Correct Answer Incorrect Answer
    C 712 Correct Answer Incorrect Answer
    D 613 Correct Answer Incorrect Answer
    E 715 Correct Answer Incorrect Answer

    Solution

    33 – 1 = 26 43 – 1 = 63 53 – 1 = 124 63 – 1 = 215 73 – 1 = 342 83 – 1 = 511 93 – 1 = 728

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