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July 23, 2014

July 23, 2014

Posted by **Sydney Ford** on Friday, October 4, 2013 at 12:29am.

- Math -
**Steve**, Friday, October 4, 2013 at 5:38amassuming they are all As, then you just need to know that

1+2+4+8+...+2^(n-1) = 2^n - 1

just use n=8

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