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    Question

    10 625 50 125 250 25

    ? What should come in the place of question mark (?) in the following number series?
    A 1890 Correct Answer Incorrect Answer
    B 1655 Correct Answer Incorrect Answer
    C 1555 Correct Answer Incorrect Answer
    D 1450 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    There are two series in this number series.
    First group is (10, 50, 250) and second is (625, 125, 25).
    Both are of the nature (×5, ÷5) and (×5, ÷5) alternatively. Hence the next number in this series is 250 × 5 = 1250.

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