Question

Kendra bought 4 paintings and wants to hang them side by side on a wall in her bedroom. However, only 3 of the paintings will fit side by side on this wall. How many different ways can Kendra arrange 3 of the 4 paintings on the wall?

Answer 1

All you want is the number of permutations for 3 out of 4:

4P3 = 4*3*2 = 24

You can pick the first in 4 ways.
Now there are 3 choices for the 2nd,
and 2 left for the 3rd.