Tree Diagrams Game (play first, then read the article)
https://lifehacker.com/5923186/how-to-use-math-and-win-free-drinks-from-your-friends
Probability Rules:
https://people.richland.edu/james/lecture/m170/ch05-rul.html
Thought Process for Combinatorics (Combinations and Permutations):
http://web.eecs.utk.edu/~booth/311-04/notes/combinatorics.html
Probability Test:
http://www.intuitor.com/student/Q2_Ch6_Probability_PracTest.php