I'm somewhat biased, but our Counting Module (https://www.gmatprepnow.com/module/gmat-counting) covers everything you need to know for the GMAT.
Also, you might want to read my latest article for BTG, "Combinations and non-Combinations": https://www.beatthegmat.com/mba/2013/07/ ... ons-part-i
Cheers,
Brent
Best online resource for Permutation Combination.
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