Posted by Geoff on Sunday, December 19, 2010 at 1:27pm.
sigma from x = 3 to x = 6 of [ x/(x+4) ]
how did you find that equation ? it there a general formula for that ?
Nope, just look at it
on top
3,4,5, 6
=2, 3+1 etc
on bottom
7,8,9,10
= 7, 7+1 etc
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