New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    Select the number from among the given options that can

    replace the question mark (?) in the following series. 24, 35, 51, 73, 102, ?
    A 151 Correct Answer Incorrect Answer
    B 139 Correct Answer Incorrect Answer
    C 131 Correct Answer Incorrect Answer
    D 149 Correct Answer Incorrect Answer

    Solution

    The given series is 24, 35, 51, 73, 102,  ? 24 + 11 = 35, 35 + 16 = 51, 51 + 22 = 73, 73 + 29 = 102, 102 + 37 = 139 . So,  139 is the missing term of the series. It is a series of double differences. So, 11, 16, 22, 29, 37. 11 + 5 = 16, 16 + 6 = 22, 22 + 7 = 29, 29 + 8 = 37

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