Combination formulas
A combination is a grouping or subset of items. For a combination, the order does not matters.
C(n,r)= nCr=n!(n−r)!r!C(n,r)=~^nC_r=\cfrac {n!}{(n-r)!r!}C(n,r)= nCr=(n−r)!r!n!
n — number of items in set.
r — number of items selected from the set.
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