I think I'm beginning to understand this, so I would appreciate if someone could critique the following:
4. A group consists of 12 men and 8 women. How many ways are there to ...
4.a) form a committee of size 5?
4.b) form a committee of size 5 containing two men and three women?
4.c) form a committee of size 6 containing at least three women?
First approach:
Second approach: