Posted by Laura on Wednesday, September 15, 2010 at 10:33pm.
Assume that the set S has 14 elements.
How many subsets of S have at most 4 elements?

math  Reiny, Wednesday, September 15, 2010 at 10:37pm
null set  1
one element  C(14,1) = 14
two elements  C(14,2) = 91
three elements  C(14,3) = 364
four elements  C(14,4) = 1001
add them up.

math  bhow, Monday, September 20, 2010 at 11:13pm
^no, I just tried it and it isn't right. any other suggestions?

math  bhow, Monday, September 20, 2010 at 11:21pm
Got it:
C(14,0)+C(14,1)+C(14,3)+C(14,4)=answer
I hate webwork.......
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