Posted by Laura on .
Assume that the set S has 14 elements.
How many subsets of S have at most 4 elements?

math 
Reiny,
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,
^no, I just tried it and it isn't right. any other suggestions?

math 
bhow,
Got it:
C(14,0)+C(14,1)+C(14,3)+C(14,4)=answer
I hate webwork.......