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These kinds of questions are very common on the current GMAT, so it's definitely worthwhile material to learn. I've found that people most often arrive at wrong conclusions with inequalities because they aren't careful about the algebra - if you see an inequality like the following:

b/c > 1

you *cannot* rewrite that as b > c, because c could be negative (in which case you would need to reverse the inequality). So if you see an inequality with unknowns, be very careful when you divide or multiply on both sides. And if you intend to choose numbers for abstract inequality questions, be absolutely sure you consider negative numbers.



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