Current location - Training Enrollment Network - Mathematics courses - To select 10 students from 7 schools to participate in the math competition, each school must have at least 1 students. How many ways are there to allocate this 10 quota?
To select 10 students from 7 schools to participate in the math competition, each school must have at least 1 students. How many ways are there to allocate this 10 quota?
Each school will definitely allocate one admission place, and the remaining three places will be allocated to these seven schools. At this time, any remaining places can be allocated to any school.
So the distribution methods are:
Each of the three schools 1, 1 student 7C3=35.
2, 1 school 1 student, two students from a school, 7P2=42.