3 A staff car park at a school has 13 parking spaces in a row. There are 9 cars to be parked.
- How many different arrangements are there for parking the 9 cars and leaving 4 empty spaces?
- How many different arrangements are there if the 4 empty spaces are next to each other?
- If the parking is random, find the probability that there will not be 4 empty spaces next to each other.