In this video, we are going to introduce ourselves to the idea of permutations, which is a fancy word for a pretty straightforward concept, which is what are the number of ways that we can arrange things? How many different possibilities are there? And to make that a little bit tangible, let's have an example with, say, a sofa. My sofa can seat exactly three people. I have seat number one on the left of the sofa, seat number two in the middle of the sofa, and seat number three on the right of the sofa. And let's say we're going to have three people who are going to sit in these three seats, person A, person B, and person C. How many different ways can these three people sit in these three seats? Pause this video and see if you can figure it out on your own.