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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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