# Function permutations

Compute the number of permutations of n items taken k at a time

    permutations(n)     permutations(n, k)

permutations only takes integer arguments the following condition must be enforced: k <= n


### Parameters

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


### Returns

Type | Description
---- | -----------
Number &#124; BigNumber | permutations




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