1. A television store owner ?gures that 50 percent of the customers entering his store will purchase an ordinary television set, 20 percent will purchase a color television set, and 30 percent will just be browsing. If ?ve customers enter his store on a certain day, what is the probability that two customers purchase color sets, one customer purchases an ordinary set, and two customers purchase nothing?

2. In Exercise 20, what is the probability that our store owner sells three or more televisions on that day?