A student faculty government committee of 4 people is to be formed from 20 student volunteers and 5 faculty volunteers. Find the probability that the committee will consist of the following, assuming the selection is made at random: a. two students and two faculty members and b. one faculty member and three students.

Question

A student faculty government committee of 4 people is to be formed from 20 student volunteers and 5 faculty volunteers.  Find the probability that the committee will consist of the following, assuming the selection is made at random:  a. two students and two faculty members and b. one faculty member and three students.

anonymous · Answer

The answer for part a in the back of the book is .15, but I don't know how they got there.