3.3 Addition Rule
http://zukowskimath.blogspot.com/2012/10/33-addition-rule.html
3.4 Counting Principles
http://zukowskimath.blogspot.com/2012/10/33-counting-prinicples.html
REVIEW NOTES
https://docs.google.com/presentation/d/1CvHaZpE_HYz61Ov009lHbPqLvWdJYltsMLsBA01wAPs/edit