A group of twelve people are going to take a ride on a roller coaster at
the same time in two different trains, one of which cannot fit more than
8 passengers, and the other cannot fit more than 7. In how many ways
can the group take a ride?
the same time in two different trains, one of which cannot fit more than
8 passengers, and the other cannot fit more than 7. In how many ways
can the group take a ride?