11. There are 8 women and 10 men in the math department. (a) How many ways can a committee of 4 people be selected? (b) How many ways can a committee of 4 people be selected if there must be 2 men and 2 women on the committee? (c) How many ways can a math department committee of 4 people be selected if there must be at least 2 men on the committee?

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