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    Question

    In each of the following number series, one term is

    wrong. Find the wrong term. 5, 12, 27, 58, 123, 248, 503
    A 58 Correct Answer Incorrect Answer
    B 123 Correct Answer Incorrect Answer
    C 248 Correct Answer Incorrect Answer
    D 503 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Pattern is x2 + consecutive numbers 5 x 2 + 2 = 12 12 x 2 + 3 = 27 27 x 2 + 4 = 58 58 x 2 + 5 = 121 121 x 2 + 6 = 248 248 x 2 + 7 = 503 So the correct series should be: 5, 12, 27, 58, 121, 248, 503 Hence, 123 is the wrong term.

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