Question

In how many ways can 10 people sit on a park bench that only seats 3? Order is important.

Answer 1

it means :
10P3 = 10!/(10-3)! = 10!/7! = (10 * 9 * 8 * 7!)/7!
cancel out the 7! giving us
= 10 * 9 * 8
= 720 ways