As I posted earlier, I disagree on your assessment of those constructions (although I do find them unusual - which is exactly why they were chosen to create a difficult problem!). They were all three taken from meticulously edited materials so I am not the only one who disagrees with your assessment...

You should be very careful on any GMAT sentence correction problem about applying rules that you believe are absolute. Sentence correction is an exercise in problem solving and leveraging differences in answer choices, not a rote regurgitation of memorized rules. In math, 2 + 2 is always 4, but in g...

HI ssgmatter, Sorry for the slow response - been away from my computer for the last week. Let me elaborate a little more on answer choice C. The conclusion states that "therefore, until the cost of extracting uranium from seawater can somehow be reduced , this method of obtaining uranium is unl...

hi gmatmachoman - the primary difficulty of this problem lies in its length - there are many individual steps. As with many harder GMAT questions, do not get overwhelmed by the complexity of the problem. Break it down into digestible pieces and attack each one separately. step 1: determine volume of...

hi bkolibov/gurpinder: an official counting problem that sets a classic trap in the final step. gurpinder's work is perfect until the end where he makes the mistake of adding instead of multiplying. this is one of the most common traps that I have seen used by the test makers for these types of comb...

Sorry for redundant post machoman - was writing mine as you posted the Kaplan explanation (which seems to cover the issues well). Good question with important takeaways for precision in language!

hi gmat_perfect - thanks for posting a great question for discussion. In any evaluate the argument question, it is best to focus on potential problems in the original argument. As you read the argument stimulus, consider what assumptions might exist that need to be clarified. One important strategy ...

If the OA is A then this is clearly a flawed question (but a good one when the flaw is removed!) - the question stem would have to tell you that M and N are non-negative integers as statement one is not sufficient if, for instance, M = -1 or -2. 1/10 + 5 is not divisible by 3 as kvpck pointed out! I...