Question 1142801
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(a) Need to choose 2 of the 7 women AND 2 of the 5 men: (7C2)*(5C2)<br>
(b) Can choose any 4 of the 12 total: (12C4)<br>
(c) Can choose any combination EXCEPT 4 women and 0 men: (12C4) - (7C4)*(4C0)<br>
You need to know the "n choose r" concept if you are going to be working problems like this.  If you aren't familiar with it, searching the internet for "n choose r" will find hundreds of places where you can find it explained.