## briana.img one year ago Find the number of permutations of the first 9 letters of the alphabet taking 6 letters at a time.

1. briana.img

Is it like 9*8*7*6*5*4 ??? = 60,480

2. jim_thompson5910

You are correct. You can also use the formula $\Large P(n,r) = \frac{n!}{(n-r)!}$

3. briana.img

I was hoping to learn it lol

4. briana.img

aaaah okay! thank you!

5. jim_thompson5910

n! = n*(n-1)*...*3*2*1 example: 7! = 7*6*5*4*3*2*1