## Permutation(n, p)

##### Last updated July 18, 2001

**Version:** 1 |
**Requires:** CF5 |
**Library:** MathLib

**Description:**

Returns the Permutation of n elements taken p at a time.

**Return Values:**

Returns a simple value.

**Example:**

```
<CFSET n=13>
<CFSET p=4>
<CFOUTPUT>
Given n=13, p=4
Permutation(n,p) is #Permutation(n,p)#
</CFOUTPUT>
```

**Parameters:**

Name | Description | Required |
---|---|---|

n | Any non-negative integer. | Yes |

p | Any non-negative integer, <= n | Yes |

**Full UDF Source: **

```
/**
* Returns the Permutation of n elements taken p at a time.
* This funciton requires the Factorial() function from this library.
*
* @param n Any non-negative integer.
* @param p Any non-negative integer, <= n
* @return Returns a simple value.
* @author Joel Cox (jlcox@goodyear.com)
* @version 1.0, July 18, 2001
*/
function Permutation(n,p)
{
var RetVal = 0;
if (p GT n) {
RetVal = "undefined";
}
else
RetVal = Factorial(n) / Factorial(n-p);
Return RetVal;
}
```

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