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Mathematics
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How many lists of integers that contain only powers of 2 have a sum of 9, if the order within each list is not important and numbers can be repeated?

Sep 2nd, 2014

only two pairs of integers 0 , 3 & 0 , - 3 

0^2 + 3^2 = 0 + 9 = 9

0^2 + ( - 3)^2 = 0 + 9 = 9

Sep 3rd, 2014

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