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      Question

      Find the missing number.

      1,3,7,15,31,63,127,....
      A 255 Correct Answer Incorrect Answer
      B 250 Correct Answer Incorrect Answer
      C 225 Correct Answer Incorrect Answer
      D 155 Correct Answer Incorrect Answer

      Solution

      ┬а ┬а255 = 28┬а- 1

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