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    Which of the following numbers will replace the question mark (?) in the given series?9, 54, 59, ?, 239 , 478​​
    Question

    Which of the following numbers will replace the question mark (?) in the given series?
    9, 54, 59, ?, 239 , 478​​

    A.

    230

    B.

    232

    C.

    234

    D.

    236

    Correct option is D

    ​​Series: 9, 54, 59, ?, 239, 478
    Logic: alternate multiplication and addition, decreasing the multiplier/addition each time.
    9 × 6 = 54
    54 + 5 = 59
    59 × 4 = 236  (Missing number)
    236 + 3 = 239
    239 × 2 = 478
    Thus, correct option is (d).

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