A small town has 4 police cars. When a radio dispatcher receives a call, depending on the nature of the situation, no cars, one car, two cars, three cars, or all four cars can be sent. How many options does the dispatcher have for sending the police cars to the scene of the caller? I know the answer is 32 but can you please explain how to get there? I don't understand where 1+5+10+10+5+1 comes from