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      Question

      7                    26    

              63             126            215       342 Find out the wrong number in the following given number series :
      A 342 Correct Answer Incorrect Answer
      B 26 Correct Answer Incorrect Answer
      C 126 Correct Answer Incorrect Answer
      D 215 Correct Answer Incorrect Answer
      E 63 Correct Answer Incorrect Answer

      Solution

      2³ - 1 = 7 3³ - 1 = 26 4³ - 1 = 63 5³ - 1 = 124 6³ - 1 = 215 7³ - 1 = 342

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