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    Question

    In each of the following number series, one term is

    missing. Find the missing term. 7, 15, 31, 63, ?, 255
    A 118 Correct Answer Incorrect Answer
    B 150 Correct Answer Incorrect Answer
    C 135 Correct Answer Incorrect Answer
    D 127 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Pattern is x2 + 1 7 x 2 + 1 = 15 15 x 2 + 1 = 31 31 x 2 + 1 = 63 63 x 2 + 1 = 127 127 x 2 + 1 = 255 So the missing term is 127.

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