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    What should come in place of ? in the given series?10, 21, 43, 87, 175, ?
    Question

    What should come in place of ? in the given series?
    10, 21, 43, 87, 175, ?

    A.

    308

    B.

    351

    C.

    376

    D.

    367

    Correct option is B

    Given series:
    10, 21, 43, 87, 175, ?
    Logic "multiply by 2 and then add 1":
    Starting with 10:
    10 × 2 + 1 = 20 + 1 = 21
    21 × 2 + 1 = 42 + 1 = 43
    43 × 2 + 1 = 86 + 1 = 87
    87 × 2 + 1 = 174 + 1 = 175
    Now, following the same pattern for the next term:
    175 × 2 + 1 = 350 + 1 = 351
    The next term in the series is 351.
    Thus, the correct answer is (B) 351.

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