Question

In how many ways can three different flower pots be lined up on a windowsill if we are choosing from 9 different plants?

Answer 1

Answer: 504 ways

Explanation:

We can choose the first flower pot on 9 ways.

That leaves 8 flower pots to choose for the one next to it.

That leaves 7 flower pots to choose for the one next to it.

Answer 2

It's a combination of 3 chosen from 9:

C₃⁹ = (9!) / (3!).(9-3)!

C₃⁹ = (9!) / (3!).(6)!

C₃⁹ = 84 Ways