Question

There are 7 people and a 5 seater car 2 people out of 7 know to drive. The total no of ways the car can be filled and driving is

Answer 1

hello...

here is your answer....

Your first way of counting is perfectly good.

If you want to count another way, let us invent 22 identical ghosts. The seats for them can be chosen in (52)(52) ways, since ghosts aren't allowed to drive. (There is a problem with taking their picture for the licence.) The rest of the seats can be filled in 4!4! ways.

Answer 2

you want to count another way, let us invent 22 identical ghosts. The seats for them can be chosen in (52)(52) ways, since ghosts aren't allowed to drive.