Re: This forum needs a sticky
C(x,y)=x!/(y!*(x-y)!}
This is the number of combinations of x things taken y at a time.
E.G. the number of ways to be dealt [edit]pocket aces in Hold'em [/edit] is C(4,2)=4!/(2!*(4-2)!)=24/4=6 ways
x!= x*(x-1)*(x-2)*...3*2*1
E.G. 4!=4*3*2*1=24
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