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      Question

      1          3          7           15

                33
      A 1 Correct Answer Incorrect Answer
      B 3 Correct Answer Incorrect Answer
      C 7 Correct Answer Incorrect Answer
      D 15 Correct Answer Incorrect Answer
      E 33 Correct Answer Incorrect Answer

      Solution

      1 + 21 = 3 3 + 22 = 7 7 + 23 = 15 15 + 24 = 31

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