Fundamental Counting Principle

Today in class we learned about "The Fundamental Counting Principal," and "Factorial Notation."
For Fundamental Principal, Mr. Piatek showed us 2 ways of getting to the answer.
-tree diagram for smaller numbers (helpful for students who are more visual)
-multiplication (to get answers for big numbers)
For Factorial Notation, Mr. Piatek made it very clear to the class how Exclamation mark works. Example- (n-1)(n-2)(n-3)! can be said as (n-1)! as they both have ! at the end.