There are 9 different colors of paint to choose from. Out of the 9 colors, how many ways can 4 different colors be chosen?

This is the concept of combination, the number of ways 4 different color can be chosen from 9 different colors will be:

9C4

= (9!) / (4! (9-4) !)

=362,880 / (24*120)

=362,880/2880

=126

thus the number of ways is 126 ways