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    Question

    5      3      4      7.5      17     

     ?       138 Find the missing number in the following number series:
    A 61 Correct Answer Incorrect Answer
    B 53 Correct Answer Incorrect Answer
    C 45 Correct Answer Incorrect Answer
    D 30 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    5 x 0.5 + 0.5 = 3  3 x 1 + 1 = 4  4 x 1.5 + 1.5 = 7.5 7.5 x 2 + 2 = 17  17 x 2.5 + 2.5 = 45   45 x 3 + 3 = 138

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