There are 7 seniors and 3 juniors in the statistics club, and a team of 5 will be randomly selected to attend the Joint Statistical Meetings in Montréal.
(a) What is the probability that all 3 juniors are picked in this team of 5?
(b) What is the probability that none of the juniors are picked in this team of 5?
(c) What is the probability that 2 of the juniors are picked in this team of 5?