Question

PLEASE HELP!!!!!!

Find the number of ways in which 9 people can be divided into 2 groups: the first group has 5 people and the second group has 4 people.

Answer 1

1. group 1: 4 people: group 2: 5 people
2. group 1: 6 people group 2: 3 people
3. group 1: 3 people group 2: 6 people
4. group 1: 2 people group 2: 7 people
5. group 1: 7 people group 2: 2 people
6. group 1: 8 people group 2: 1 person
7. group 1: 1 person group 2: 8 people
8. group 1: 9 people group 2; 0 people
9. group 1 : no people group 2: 9 people