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combinatorics
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Factorial n!
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combinatorics
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n! = n · (n-1) · … · 1 with 0! = 1. Counts permutations of n objects.
Related concepts
Permutation P(n,k)
Combination C(n,k) = nCr
Pigeonhole principle
Natural numbers (ℕ)
Viswanath's constant
Stirling numbers
Cayley's formula
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