# Math Help - probability or statistics

1. ## probability or statistics

I have a problem in math. It is: 6P6 . I don't know what P means! HELP!
Thanks
puppylove
need help ASAP!

2. nPr= n!/(n-r)!
In case you are wondering n!=1*2*3*,...n
6!=6*5*4*3*2*1=720
0!=1
These are built in to most calculators.

3. ## Len...

How did you get (6-6)=6! ? I'm so confused!
puppylove

4. Originally Posted by puppylove
How did you get (6-6)=6! ?
puppylove
I didn't, the formula is $nPr=\frac{n!}{(n-r)!}$

so $6P6=\frac{6!}{(6-6)!}= \frac{6!}{(0)!}=\frac{720}{1}=720$