## Algebra 1: Common Core (15th Edition)

We know that: $_nP_r = \frac{n!}{(n-r)!}$ $_{12}P_9 = \frac{12!}{(12-9)!}$ $\frac{12!}{3!}$ We also know that: $x! = x(x-1)(x-2)...(1)$ Thus, we have: 79,833,600