Question

a group of 10 people have gotten together to play basketball. they will begin by dividing themselves into two teams of 5 players each. one team will wear red uniforms and the other will wear blue uniforms. in how many ways can this be done?

Answer 1

9!

Explanation:

Because a person who switch with 9 people, then another person switch with 8 people (because the first person was already counted), then another person who switch with 7 people (becsuse the first and the second person was already counted)... and you will get 9!. 9! is 9 factorial which is 9×8×7×6×5×4×3×2×1. :)