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      Question

      In each of the following number series, one term is

      missing. Find the missing term. 7, 15, 31, 63, ?, 255
      A 118 Correct Answer Incorrect Answer
      B 150 Correct Answer Incorrect Answer
      C 135 Correct Answer Incorrect Answer
      D 127 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Pattern is x2 + 1 7 x 2 + 1 = 15 15 x 2 + 1 = 31 31 x 2 + 1 = 63 63 x 2 + 1 = 127 127 x 2 + 1 = 255 So the missing term is 127.

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