mathjs
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Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif
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Compute the number of ways of obtaining an ordered subset of `k` elements
from a set of `n` elements.
Permutations only takes integer arguments.
The following condition must be enforced: k <= n.
```js
math.permutations(n)
math.permutations(n, k)
```
Parameter | Type | Description
--------- | ---- | -----------
`n` | number &
`k` | number &
Type | Description
---- | -----------
number &
```js
math.permutations(5) // 120
math.permutations(5, 3) // 60
```
[ ](combinations.md),
[ ](combinationsWithRep.md),
[ ](factorial.md)