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

    Question

    What should come in place of question mark ‘?’ in the following number series?

    1        1        4         ? 

          280         3640
    A 28 Correct Answer Incorrect Answer
    B 74 Correct Answer Incorrect Answer
    C 40 Correct Answer Incorrect Answer
    D 92 Correct Answer Incorrect Answer

    Solution

    1 × 1 = 1 1 × 4 = 4 4 × 7 =  28 28 × 10 = 280 280 × 13 = 3640

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