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    Question

    Which of the following numbers will replace the question mark (?) in the given series?

    28 39 63 102 158 ?

    A 232 Correct Answer Incorrect Answer
    B 242 Correct Answer Incorrect Answer
    C 233 Correct Answer Incorrect Answer
    D 244 Correct Answer Incorrect Answer

    Solution

    The series is +(10 x 1 + 12), +(10 x 2 + 22), +(10 x 3 + 32), +(10 x 4 + 42), +(10 x 5 + 52),….. ie 28 + 10 x 1 + 12 = 39, 39 + (10 x 2 + 22) = 63, 63 + (10 x 3 + 32) = 102, 102 + (10 x 4 + 42) = 158, 158 + (10 x 5 + 52) = 233, ...

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