binomial

Find the number of ways to choose k elements from a set of n elements.

Similar: factorial, binomial, multinomial.

function binomial(n, k)
// n: elements in source set
// k: elements in choose set

const xmath = require('extra-math');


xmath.binomial(4, 1);
// → 4

xmath.binomial(4, 2);
// → 6

xmath.binomial(4, 3);
// → 4

References

• alawatthe/MathLib binomial.ts
• Binomial coefficient: Wikipedia