1) A person needs to make up a four-digit code to open the lock on the garage door. The person decides to use four different digits from the first four digits, 0 through 3. How many different codes can be made?
2) A business owner wishes to rank the top 3 locations selected from 5 locations for a business. How many different ways can she rank them?
3) A school musical director can select 2 musical plays to present next year. One will be presented in the fall, and the one will be presented in the spring. If she has 9 to pick from, how many different possibilities are there?