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11 cards from this deck
Ways to select items without considering order
Order doesn't matter in combinations; does in permutations
C(n,r)=n!r!(n−r)!C(n, r) = \frac{n!}{r!(n-r)!}C(n,r)=r!(n−r)!n!
Total number of items
Number of items to select
Product of all positive integers up to that number
5×4×3×2×1=1205 \times 4 \times 3 \times 2 \times 1 = 1205×4×3×2×1=120
120120120 ways
300330033003 ways
Selecting groups, teams, subsets where order is irrelevant
Factorials
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