There are 7 women and 5 men in a department. four people are needed for a committee.
a. in how many ways can a committee of 4 people be selected?
b. in how many ways can this committee be selected if there must be exactly 2 men and 2 women on the committee?
c. in how many ways can this committee be selected if there must be at least 2 women on the committee?
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