# How do you calculate permutations of numbers?

##### 1 Answer

Oct 31, 2014

Permutations are arrangements of items, so the number of permutations is the number of arrangements of items.

Let

**Example**

How many 3-digit codes are possible if each digit is chosen from 0 through 9, and no digits are repeated.

We can think of 3-digits codes as permutations of

Hence, there are 720 possible 3-digit codes.

I hope that this was helpful.