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<h1 id="function-permutations">Function permutations <a href="#function-permutations" title="Permalink">#</a></h1>

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.


<h2 id="syntax">Syntax <a href="#syntax" title="Permalink">#</a></h2>

```js
math.permutations(n)
math.permutations(n, k)
```

<h3 id="parameters">Parameters <a href="#parameters" title="Permalink">#</a></h3>

Parameter | Type | Description
--------- | ---- | -----------
`n` | number &#124; BigNumber | The number of objects in total
`k` | number &#124; BigNumber | The number of objects in the subset

<h3 id="returns">Returns <a href="#returns" title="Permalink">#</a></h3>

Type | Description
---- | -----------
number &#124; BigNumber | The number of permutations


<h3 id="throws">Throws <a href="#throws" title="Permalink">#</a></h3>

Type | Description
---- | -----------


<h2 id="examples">Examples <a href="#examples" title="Permalink">#</a></h2>

```js
math.permutations(5)     // 120
math.permutations(5, 3)  // 60
```


<h2 id="see-also">See also <a href="#see-also" title="Permalink">#</a></h2>

[combinations](combinations.html),
[combinationsWithRep](combinationsWithRep.html),
[factorial](factorial.html)