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      Question

      5 11 23 43 85 171

      341 Find the wrong number in the following number series:
      A 23 Correct Answer Incorrect Answer
      B 85 Correct Answer Incorrect Answer
      C 171 Correct Answer Incorrect Answer
      D 341 Correct Answer Incorrect Answer
      E 11 Correct Answer Incorrect Answer

      Solution

      5 × 2 + 1 = 11
      11 × 2 - 1 = 21
      21 × 2 + 1 = 43
      43 × 2 - 1 = 85
      85 × 2 + 1 = 171
      171 × 2 - 1 = 341

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