A Formula for Pascal's Triangle (TANTON Mathematics)

Well ... "A formula" is not quite the right phrase here, but I will show you in this video how to write down a formula for the 87-th entry of the 198-th row of Pascal's triangle (or any other entry of your choosing) in less than two seconds! And once you see where these entries are coming from, you are all set to understand the binomial theorem. (It's another video!)