Help on Probability for Clep mathematics test

[chalmers]

Hi,
So I am taking my Clep Mathematics test in a weeks. I'm doing ok ,but probability is the thing
I'm struggling with. I know how to do combinations and permutations and I'm using Rea's study guide
,but I can't remember all the formulas and I don't know what to do. Is there an online resource I can use?
I've been using khan academy but I've run into some complicated ones on instacert's flashcard set.