 This bootcamp takes you through several mathematical concepts and techniques that you need in order to do the introduction to statistics course. On your calculator, you'll probably notice there's a key with an exclamation point. If you've never used it before, that's a factorial. Any number, any integer, we can get the factorial of any integer as the product of all of the integers between that number and one. Easiest to see with an example. Take a look at the examples. 6 factorial is equal to 6 times 5 times 4 times 3 times 2 times 1. And if you do all of those multiplications, you have 720. And just as a little little item, if you take 8 factorial, is yes, it's 8 times 7 times 6 times 5 times 4 times 3 times 2 times 1. But notice that inside of 8 factorial, we have 6 factorial. So if we already computed 6 factorial, all we need to do is take 8 times 7, which is 56, and multiply it by 6 factorial, which we know to be 720, and you get 40,320. Notice, factorials blow up really quickly. They get large really, really fast. And just so we have it as a starting point, some formulas need it. Zero factorial, even if it doesn't make any sense, is the equivalent to 1. If you ever see zero factorial, that's equal to 1. To find more boot camp modules, visit the stat course at the URL you see there. And go to the navigation bar on the left, click boot camp, and you'll see all kinds of things that are good to do prior to the statistics course. Many of you have already done this before and maybe only need a refresher.