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      Question

      Find the missing number in the givens series. 63,

      99, ?, 195, 255
      A 143 Correct Answer Incorrect Answer
      B 138 Correct Answer Incorrect Answer
      C 140 Correct Answer Incorrect Answer
      D 135 Correct Answer Incorrect Answer

      Solution

      8Β² – 1 = 64 – 1 = 63 10Β² – 1 = 100 – 1 = 99 12Β² – 1 = 144 – 1 = 143 14Β² – 1 = 196 – 1 = 195 16Β² – 1 = 256 – 1 = 255

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