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    What should come in place of '?' in the given series?13, 34, 76, 160, 328, ?
    Question

    What should come in place of '?' in the given series?
    13, 34, 76, 160, 328, ?

    A.

    625

    B.

    664

    C.

    672

    D.

    638

    Correct option is B

    Given:
    13, 34, 76, 160, 328, ?
    Logic: the difference is multiplied by 2 each time:
    13 + 21 = 34 (Initial difference is 21)
    34 + 42 = 76 (The difference 21 is multiplied by 2: 21 × 2 = 42)
    76 + 84 = 160 (The difference 42 is multiplied by 2: 42 × 2 = 84)
    160 + 168 = 328 (The difference 84 is multiplied by 2: 84 × 2 = 168)
    328 + 336 = 664 (The difference 168 is multiplied by 2: 168 × 2 = 336)
    Thus, the next number in the series is 664,
    Correct answer is (b) 664.

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