Let's say you have 24 children, and 6 different flavours of candy, which 4 of each flavour. A child cannot get more than one candy. How many ways are there to distribute these 6 flavours of candy?
Edit: The solution
For the first flavor, 4 of the 24 students are selected. Then for the second flavor, 4 students are selected from the 20 students who remain, and so on. Thus, the number of different ways to distribute the 6 flavors of candy to 24 children is:
(24 choose 4) * (20 choose 4) * (16 choose 4) * ... * (4 choose 4) = 24! / (4!)^6