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    Question

    Find out the wrong number in the following given number series :

    7                    26    

            63             126            215       342
    A 342 Correct Answer Incorrect Answer
    B 26 Correct Answer Incorrect Answer
    C 126 Correct Answer Incorrect Answer
    D 215 Correct Answer Incorrect Answer
    E 63 Correct Answer Incorrect Answer

    Solution

    2³ - 1 = 7 3³ - 1 = 26 4³ - 1 = 63 5³ - 1 = 124 6³ - 1 = 215 7³ - 1 = 342

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