i need a guide/help with combinations!

[benjiboo]

is there a post/discussion/site to help me with combinations? I am really weak at combinations (and probability)... specially when they are combined. Combination/permutation/probability questions are pretty much the only type of question I have gotten wrong on my last 4 practice test, and are the ones keeping me out of the 700 range.

I just have a lot of trouble with the set up and understanding which type of question it is. I have already read many things on the net, and this site is my last hope!

Any guides/links/files/books/problems to help explain this to me? Whoever helps me the most I will gladly donate $10 via paypal for your time.

[beatthegmat]

Moving this topic to the 'GMAT Math' section.

Check out the Math Section of the Useful GMAT and MBA Links section of this website: https://www.beatthegmat.com/a/resources#linkcat-40

You'll find plenty of free resources/guides to help you on combinations and probability.

And save your $10--you'll need to save for that big $250 GMAT registration fee!