mathjs/lib/expression/docs/function/probability/permutations.js

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.

module.exports = {
  'name': 'permutations',
  'category': 'Probability',
  'syntax': [
    'permutations(n)',
    'permutations(n, k)'
  ],
  'description': 'Compute the number of permutations of n items taken k at a time',
  'examples': [
    'permutations(5)',
    'permutations(5, 4)'
  ],
  'seealso': ['combinations', 'factorial']
};