### Permutations and combinations : Example: Ways to arrange colors

##### By: Sal Khan, Monterey Institute for Technology and Education

Thinking about how many ways you can pick four colors from a group of 6

Basics of probability and combinatorics. If want to display your Chuck Norris dolls on your desk at school and there is only room for five of them. Unfortunately, you own 50. How many ways can you pick the dolls and arrange them on your desk? What if you