Chapter 7.3, Problem 15E

A country park system rates its $20$ golf courses in increasing order of difficulty as bronze, silver, or gold. There are only two gold courses and twice as many bronze as silver courses.

$\left(\text{A}\right)$ If a golfer decides to play a round at a silver or gold course, how many selections are possible?

$\left(\text{B}\right)$ If a golfer decides to play one round per week for $3$ weeks, first on a bronze course, then silver, then gold, how many combined selections are possible?