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Falling factorial
Binomial coefficient (for integers)
Binomial coefficient (in general)
Pascal's rule
Pascal's triangle
Binomial formula
Inclusion-exclusion principle (for cardinality of 2 sets)
Rule of sum
Rule of product
Pidgeonhole principle (Dirichlet's drawer principle)
Inclusion-exclusion principle (for cardinality of 3 sets)
Rising factorial
Permutation (combinatorics)
n! (permutations)
k-combination
n choose k (set theoretic)
Multiset (or bag)
n+k-1 choose k (set theoretic)
Rule of sum (formula)
Rule of product (formula)
Inclusion-exclusion principle (for cardinality of n sets)
Multinomial coefficient
Partition (of a set)
