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March 2, 2015

March 2, 2015

Posted by **Ashley** on Friday, February 28, 2014 at 4:43pm.

- Math 30-2 -
**Steve**, Friday, February 28, 2014 at 4:48pm7C4 + 7C5 + 7C6 + 7C7 = 64

since

n

∑ nCk = 2^n

k=0

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