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

    Question

    What should come in place of the question mark (?) in the following number series?

    3,     2,     3,    8,    31,   

    ?
    A 154 Correct Answer Incorrect Answer
    B 155 Correct Answer Incorrect Answer
    C 156 Correct Answer Incorrect Answer
    D 157 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    3 × 1 - 1 = 2 2 × 2 - 1= 3 3 × 3 - 1= 8 8 × 4 - 1 = 31 31 × 5 - 1= 154

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