factorial

Find the factorial of a bigint.

Similar: factorial, binomial, multinomial.

function factorial(n, k)
// n: a bigint
// k: denominator factorial [0]

const xbigint = require('extra-bigint');


xbigint.factorial(5n);
// → 120n

xbigint.factorial(6n);
// → 720n

xbigint.factorial(7n);
// → 5040n

References

• alawatthe/MathLib factorial.ts
• Permutation: Wikipedia