resources on sets, probability and permutations

Problem Solving — algebra and arithmetic (GMAT Focus Edition)
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by gabriel » Tue Oct 07, 2008 2:52 pm
Believe me you dont have to "master" Permutation and combination, you would hardly find 3 or 4 question on P&C and probability. Just solve those simple questions you find in OG or other GMAT books and it should be enough.