Question

Pls help me I’m so confused. I thought I was doing it right but it wasn’t

Answer 1

There are 220 possible ways

Explanation:

12!/3!(12-3)!

12!/3!•9!

12•11•10•9! / 3!•9! *now you can cancel both 9!

12•11•10 / 3!

12•11•10 / 3•2•1

1320/6

220