6 videos
1 skill
You 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?

Factorial and counting seat arrangements

VIDEO 9:01 minutes
Sal explains a tricky factorial problem about counting seat arrangements.

Permutation formula

VIDEO 7:35 minutes
Sal explains the permutation formula and how to use it.

Possible three letter words

VIDEO 5:39 minutes
Sal explains how to find all of the possible three letter words when we can use each letter as many times as we want, and when each letter can only be used once.

Zero factorial or 0!

VIDEO 4:50 minutes
Sal explains the intuition behind zero factorial.

Ways to arrange colors

VIDEO 3:45 minutes
Thinking about how many ways you can pick four colors from a group of 6

Ways to pick officers

VIDEO 2:19 minutes
How many ways can we pick officers for our organization?


Introductory permutation problems.