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#### Raerin

##### Member

- Oct 7, 2013

- 46

**In how many ways can a 4-member committee be formed from a girl rep and a boy rep from each of grades 9, 10, 11, and 12?**

a) There is no restriction?

a) There is no restriction?

I did 8C4 = 70, but apparently the correct answer is 28. I just want to confirm if my answer is right or not.

**b) David and Ryan can not both be on the committee?**

6C3 * 2C1 = 40 but, again, the apparent answer is 55.

**c) Leigh and Sarah will either be on or off the committee?**

I have no idea what to do for this restriction.