factorial - nodef/extra-number GitHub Wiki
Find the factorial of a number.
Similar: factorial, binomial, multinomial.
function factorial(n, k)
// n: a number
// k: denominator factorial [0]
const xnumber = require('extra-number');
xnumber.factorial(5);
// → 120
xnumber.factorial(6);
// → 720
xnumber.factorial(7);
// → 5040