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    Question

    What should come in place of the question mark (?) in the following number series.

    52 25 27 ? 208

    1648
    A 40 Correct Answer Incorrect Answer
    B 50 Correct Answer Incorrect Answer
    C 55 Correct Answer Incorrect Answer
    D 65 Correct Answer Incorrect Answer
    E 70 Correct Answer Incorrect Answer

    Solution

    52 × 0.5 – 1 = 25 25 × 1 + 2 = 27 27 × 2 – 4 = 50 50 × 4 + 8 = 208 208 × 8 – 16 = 1648

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