All students attend the competition and the winners are exactly 3 freshmen and 3 sophomores.
56700
54700
57600
58700
57900
The number of orders in which all the students attend the competition and exactly 3 freshmen and 6 sophomores win prizes =4C3×6C3 ×6! = 57600.
All students attend the competition and the winners are an equal number of freshmen, sophomores and juniors.
All the students attend the competition and exactly 2 freshmen win prizes.
All students attend the competition and the winners are all members of the same class.
How many combinations of students are possible if the group is to consist of an equal number of freshmen, sophomores, and juniors?