Question

A college student purchased 10 posters for her dorm room, but she only has space to hang six of them. How many specific ways can she arrange and hang these six posters on her wall?
60
8
151,200
210

Answer 1

have 10 ways to have 9 ways to have 8 ways to have 7 ways to have 6 ways have 5 ways to pick the poster
so just multiply
10 x 9 x 8 x 7 x 6 x 5