There are 4 letters. Using some simple math, we find that 4! = 4*3*2*1 = 24.

There are 24 combinations.

You can test this with smaller numbers to see if it works. For example. PIG

3! = 3*2*1 = 6

PIG PGI GIP GPI IGP IPG

There are 24 combinations.

You can test this with smaller numbers to see if it works. For example. PIG

3! = 3*2*1 = 6

PIG PGI GIP GPI IGP IPG