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      Question

      20 9 10 ? 29 71.5

      What should come in place of the question mark (?) in the following number series?
      A 21 Correct Answer Incorrect Answer
      B 25 Correct Answer Incorrect Answer
      C 19 Correct Answer Incorrect Answer
      D 14 Correct Answer Incorrect Answer
      E 17 Correct Answer Incorrect Answer

      Solution

      20 × 0.5 – 1 = 9 9 × 1 + 1 = 10 10 × 1.5 – 1 = 14 14 × 2 + 1 = 29 29 × 2.5 – 1 = 71.5

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