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    Question

    640 320 160 ? 40

    20 What should come in place of the question mark (?) in the following number series?
    A 80 Correct Answer Incorrect Answer
    B 70 Correct Answer Incorrect Answer
    C 60 Correct Answer Incorrect Answer
    D 90 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    640 × 1/2 = 320 320 × 1/2 = 160 160 × 1/2 = 80 80 × 1/2 = 40 40 × 1/2 = 20

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