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Videos for Section 4.1
Introduction to sets (13:34) 
Videos for Section 4.2
Set operations and Venn diagrams (17:49)
Videos for Section 4.3
Venn diagrams and data (15:50)
Venn Diagram Example (6:36)
Videos for Section 4.4-4.5
Multiplication principle and tree diagrams (19:10)
Permutations and Combinations (29:29)
Counting ways to pick a committee (4:34)
Example of Venn Diagram for organizing data (6:35)
Counting patterns (4:56)
Some review problems (17:43)
More review problems (14:50)
House Inspections (11:28)
Wrong Solutions (14:58)
