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      Question

      Select the number from the given option that can

      replace the question mark (?) in the following series: 15, 63, 126, ?, 305, 425
      A 205 Correct Answer Incorrect Answer
      B 206 Correct Answer Incorrect Answer
      C 207 Correct Answer Incorrect Answer
      D 208 Correct Answer Incorrect Answer

      Solution

      The logic followed here is as follows: 15 + (7Β² βˆ’ 1) = 15 + 48 = 63 63 + (8Β² βˆ’ 1) = 63 + 63 = 126 126 + (9Β² βˆ’ 1) = 126 + 80 = 206 206 + (10Β² βˆ’ 1) = 206 + 99 = 305 305 + (11Β² βˆ’ 1) = 305 + 120 = 425

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