Counting Theory

The Basic Counting Principle

https://www.mathsisfun.com/data/basic-counting-principle.html

Probability: Independent Events

https://www.mathsisfun.com/data/probability-events-independent.html

Conditional Probability

https://www.mathsisfun.com/data/probability-events-conditional.html

https://www.cse.unr.edu/~bebis/CS365/Lect/Combinatorics.ppt

Information: Counting Theory