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?

    19    20    42    129    ?      2605 

     .  
    A 650 Correct Answer Incorrect Answer
    B 560 Correct Answer Incorrect Answer
    C 455 Correct Answer Incorrect Answer
    D 520 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    19 × 1 + 1 = 20 20 × 2 + 2 = 42 42 × 3 + 3 = 129 129 × 4 + 4 = 520 520 × 5 + 5 = 2605

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