help on math

pgclt

I just started to prepare GMAT and really want to find a good math review/summary. Where can I find it? pls help!

Quick question, for permutation and combination, are the following formulars correct? (you can tell how long I have been away from math...)

P(n,m)=n!/(n-m)!
C(n,m)=n!/[m!(n-m)!]

tongxun

1、Do you have OG？ There are many usefull information about math in OG。
2、According to your functions， they are right！