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    Which of the following numbers will replace the question mark (?) in the given series? 2, 9, 37, 149, ?, 2389
    Question

    Which of the following numbers will replace the question mark (?) in the given series?
    2, 9, 37, 149, ?, 2389

    A.

    542

    B.

    648

    C.

    646

    D.

    597

    Correct option is D


    Given: 2, 9, 37, 149, ?, 2389
    Logic: The series increases by multiple of 4 and +1 each time:
    2 × 4 + 1 = 8 +1 = 9
    9 × 4 + 1 = 36 + 1 = 37
    37 × 4 + 1 = 148 + 1 = 149
    149 × 4 + 1 = 596 + 1 = 597
    597 × 4 + 1 = 2388 + 1 = 2389
    Correct answer is (d) 597.

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