1. A psychological study of outstanding salespeople is to be made. If 5 salespeople are needed and 12 are qualified, in how many ways can the 5 be selected?
2. A company wishes to use the services of 3 different banks in the city. If 15 banks are available, in how many ways can it choose the 3 banks?
3. To determine voters' feelings regarding an issue, a candidate asks a sample of people to pick 4 words out of 10 that they feel best describe the issue. How many different groupings of 4 words are possible?