HiThese two topics are invariably considered by many GMAT aspirants to be tougher than a whole lot of other topics in the quant section of the GMAT test.The biggest advantage with a Permutation Combination or a Probability question is that many a times you will not have the need to do any calculation at all. Most answers will be either mentioned in terms of factorials or as 3C2 … [Read more...] about Permutation Combination and Probability – Sampling with / without replacement