To decide what to eat at a restaurant, frank closes his eyes, places his finger on the menu, and orders whichever dish he places his finger on. he chooses one salad, one main course, and a dessert. if there were 10 possible dishes for each selection, how many possible combinations could he have chosen other than the one he selected?

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?