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    Question

    51 26 27 ? 86

    217.5 What should come in place of the question mark (?) in the following number series?
    A 52 Correct Answer Incorrect Answer
    B 42 Correct Answer Incorrect Answer
    C 38 Correct Answer Incorrect Answer
    D 63 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    51 × 0.5 + 0.5 = 26 26 × 1 + 1 = 27 27 × 1.5 + 1.5 = 42 42 × 2 + 2 = 86 86 × 2.5 + 2.5 = 217.5

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