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OpenStudy (dls):
Anyway to simplify this sum ?
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OpenStudy (dls):
C(n,r) + C(n-1,r-1) + C(n-2,r-2) + C(n-3,r-3)...
OpenStudy (sparrow2):
oh it's i thinkg geometric series
OpenStudy (sparrow2):
you myltiply every other member by r/n
OpenStudy (sparrow2):
|dw:1455105673397:dw|
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