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12 cards from this deck
Arrangement of objects in a specific order
Order of selection matters
Product of all positive integers up to nnn
n×(n−1)×(n−2)×…×1n \times (n-1) \times (n-2) \times \ldots \times 1n×(n−1)×(n−2)×…×1
n!n!n!
n!(n−r)!\frac{n!}{(n-r)!}(n−r)!n!
n!p1!×p2!×…×pk!\frac{n!}{p_1! \times p_2! \times \ldots \times p_k!}p1!×p2!×…×pk!n!
242424
606060
333
Reduces total permutations
Counting problems and probability
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