Question

Yancey collects plastic banks. He has three different banks: a pig, a cow, and a horse. How many ways can Yancey arrange his banks on a shelf

Answer 1

First position can be filled in 3 ways

2nd position can be filled in 2 ways
leaving the last position to be filled in only 1 way

so number of ways = 3x2x1 = 6

or you can see the pattern here:

PCH
PHC
CPH
CHP
HPC
HCP