Anyone help with these Combinations? 1. C(18,2) 2. C(18,3) 3. C(18,4)

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Anyone help with these Combinations? 1. C(18,2) 2. C(18,3) 3. C(18,4)

Mathematics
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\[C(n,k)=\frac{n!}{(n-k)!k!}\]
use this formula
! means factorial correct?

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Other answers:

you are dead right!
which is just for my problem 18x17x16...........x1 right?
yes but you may observe in denominator (18-2)!=16! and you may simplify them
ok thank you so much

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