Question
1 Â Â Â Â Â Â 3 Â Â Â Â Â Â 7 Â Â Â Â Â Â Â 15
       33Solution
1 + 21Â = 3 3 + 22Â = 7 7 + 23 = 15 15 + 24Â = 31
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