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      Question

      Select the number from the given option that can

      replace the question mark (?) in the following series. 15, 24, 35, 48, 63, ?Β 
      A 80 Correct Answer Incorrect Answer
      B 99 Correct Answer Incorrect Answer
      C 81 Correct Answer Incorrect Answer
      D 64 Correct Answer Incorrect Answer

      Solution

      The logic followed here is as follows, 4Β² – 1 = 16 – 1 = 15 5Β² – 1 = 25 – 1 = 24 6Β² – 1 = 36 – 1 = 35 7Β² – 1 = 49 – 1 = 48 8Β² – 1 = 64 – 1 = 63 9Β² – 1 = 81 – 1 = 80 So, β€˜80’ will replace the question mark in the given series.

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