Multinomial distribution (WMA)
Multinomial[$n_1$, $n_2$, ...]Multinomial[2, 3, 4, 5]
Multinomial[]
Multinomial is expressed in terms of Binomial:
Multinomial[a, b, c]
Multinomial[n-k, k] is equivalent to Binomial[n, k]:
Multinomial[2, 3]
See also Binomial.