If a club has 12 members, what is the ratio of the number of different possible 6-member committees that can be formed to the number of different possible 5-member committees that can be formed? Congratulations! If you have memorized the Combination formula and desperately want to use it but are beginning to realize that (naturally) … Read More
If b is a positive integer and b^4 is divisible by 81 GMAT If b is a positive integer and b^4 is divisible by 81, which of the following could be the remainder when b is divided by 9? This is an interesting new question type that has appeared since the Focus questions have been … Read More
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The domain of the function f(x) = \frac(x-1)(x+1) is the set of all real numbers that are: Oof–that’s a huge chunk of code, which I had to put on here just so you could find it! Sorry–let’s try that one again in a way that actually makes some sense… The domain of the function f(x) … Read More