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    Question

    What should come in place of the question mark (?) in

    the following series? 3, 7, 15, 31, 63, ?
    A 168 Correct Answer Incorrect Answer
    B 576 Correct Answer Incorrect Answer
    C 177 Correct Answer Incorrect Answer
    D 127 Correct Answer Incorrect Answer

    Solution

    The correct answer is D

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