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    Question

    Find the wrong number in the series. 2, 3, 7, 15,

    31, 63, 127
    A 3 Correct Answer Incorrect Answer
    B 2 Correct Answer Incorrect Answer
    C 15 Correct Answer Incorrect Answer
    D 127 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Each term: Previous term × 2 + 1

    2 × 2 + 1 = 5 (but given is 3 incorrect)

    Correct series:

    2, 5, 11, 23, 47, 95, 191

    (×2 + 1 pattern)

    3 is wrong, should be 5

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