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Find the number of ways to put n objects in m bins (n=sum(kᵢ)).
Similar: factorial, binomial, multinomial.
function multinomial(...ks) // ks: objects per bin (kᵢ)
const xnumber = require('extra-number'); xnumber.multinomial(1, 2); // → 3 xnumber.multinomial(1, 2, 3); // → 60 xnumber.multinomial(1, 2, 3, 4); // → 12600