Of 10 available candidates for membership in a university committee, 6 are men and 4 are women.

Question:

Of 10 available candidates for membership in a university committee, 6 are men and 4 are women. The committee is to consist of 4 persons.
(a) How many different selections of the committee are possible?
(b) How many selections are possible if the committee must have 2 men and 2 women?