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    Question

    9     20      63       255      

    1285      7716 In each of these questions a number series is given. In each series only one number is wrong. Find out the wrong number.
    A 255 Correct Answer Incorrect Answer
    B 1285 Correct Answer Incorrect Answer
    C 63 Correct Answer Incorrect Answer
    D 7716 Correct Answer Incorrect Answer

    Solution

    9 x 2 + 2 = 20 20 x 3 + 3 = 63 63 x 4 + 4 =  256 256 x 5 + 5 = 1285 1285 x 6 + 6 = 7716

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