a group of 6 women and 9 men will form four person committees. how many committees are possible if it must consist of the following:

3 men and 2 women
a. 102
b. 540
c. 1 365
d. 1 260

4 men and 3 women
a. 2, 520
b. 2 560
c. 2 580
d. 3 000

all 6 women
a. 750
b. 720
c. 780
d. 820​