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?

    80, 255, 624, ?, 2400,

    4095
    A 1428 Correct Answer Incorrect Answer
    B 1255 Correct Answer Incorrect Answer
    C 1018 Correct Answer Incorrect Answer
    D 1295 Correct Answer Incorrect Answer
    E 1215 Correct Answer Incorrect Answer

    Solution

    3⁴ - 1 = 80 4⁴ - 1 = 255 5⁴ - 1 = 624 6⁴ - 1 = 1295 7⁴ - 1 = 2400 8⁴ - 1 = 4095

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