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10 cards from this deck
Ordering of objects where sequence matters
Permutations
Order matters
n!n!n!
n×(n−1)×(n−2)×⋯×2×1n \times (n-1) \times (n-2) \times \cdots \times 2 \times 1n×(n−1)×(n−2)×⋯×2×1
n!(n−r)!\frac{n!}{(n-r)!}(n−r)!n!
nPr^nP_rnPr
111
Deal with the restriction first
nrn^rnr
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