Hello!

I haven't done much math in a while and I really need help learning how to do probability. The question is:

Sixteen students (made up from 10 men and 6 women) have volunteered to be ushers at a concert. Since only 4 ushers are required, a draw will be made to select them. What is the probability that the ushers selected will be:

a) 4 Women

b) 4 Men

c) 2 Men and 2 Women

I would really appreciate if someone could help me learn this as soon as possible!