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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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