1. As a supervisor, Rob is choosing four of his employees to work on a special project. The employees are Angela, Barbara, Colin, David, and Elizabeth. Of those five employees, how many teams of four are possible? 2. Jessica wants to take three books on vacation with her. She has five books to choose from. How many possible combinations of three books could she take on vacation? 3. Grant is cooking a homemade pizza, and he has the following toppings available: an- chovies, ham, mushrooms, and sausage. He will choose three of those toppings. How many ways could Grant combine those toppings?