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OpenStudy (anonymous):
Anyone help with these Combinations? 1. C(18,2) 2. C(18,3) 3. C(18,4)
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OpenStudy (anonymous):
\[C(n,k)=\frac{n!}{(n-k)!k!}\]
OpenStudy (anonymous):
use this formula
OpenStudy (anonymous):
! means factorial correct?
OpenStudy (anonymous):
you are dead right!
OpenStudy (anonymous):
which is just for my problem 18x17x16...........x1 right?
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OpenStudy (anonymous):
yes but you may observe in denominator (18-2)!=16! and you may simplify them
OpenStudy (anonymous):
ok thank you so much
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