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"How Do You Simplify 3 Composite Sums!?" was posted on Thursday, July 9th, 2009 at 6:38 pm.
2 Responses to “How Do You Simplify 3 Composite Sums!?”
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you have to start form rigth to left
the first one is from the right is equal to j
now the second is equal to i(i+1)/2
the last one is 1(1+1)2 + 2(2+1)/2+ . . .+7(7+1)/2
=84
That’s the same as 7-sigma- k=1. So the answer is 1+1+1+1+1+1+1 = 7