# How do you calculate permutations using the formula?

##### 1 Answer

Nov 4, 2014

Permutations are the way to take n things from r possibilities. There is no uniqueness required of the arrangements either.

The formula is

The ! symbol is for factorials, which is denoted below:

So let us say we wanted 5 permutations of 3. We have:

Which simplifies to

Which is

This becomes