For variable-based problems on the GRE quant (ie "if x3, then.."), you can "plug in" numbers to test the answers out and see which are even feasible to be correct. But not all "plug in" numbers are created equal - some are much more useful to use than others for eliminating wrong answers and ensuring you don't fall into any traps. Orion shares his hierarchy of the best plug-in numbers to use on the GRE quant.

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