Introduction to Factorials!

Hello everyone! Don't you all love exclamation marks? It makes things that we type seem more important or makes it LOUD. We usually see exclamation marks in a written context, but today I will talk about the exclamation marks you see in math.

Today's topic is FACTORIALS! The factorial is presented with an exclamation mark that you may see after a number or a variable. In the beginning of the video, you see things like 25!/24! or 15·14!/15! or 50!/100! There is a formula for factorials but its pretty simple. 5! is 5·4·3·2·1

Formula for Factorials: n! = n·(n-1)·(n-2)·(n-3)·...·1

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