n2739178 wrote:

GMAT Prep question... What's the easiest way to solve this using MGMAT style case-charts?

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Not sure what you mean by MGMAT style case charts. But this question is quite straight forward

For r,s positive : r/s is less than 1, when r<s. which we know

rs : No need for this to be less than 1 (r could be almost 1 and s could be 1.5 or 1.7)

s-r : No need for this to be less than 1 (r could be almost 0 and s could be 1.5 or 1.7)

Think of extreme cases in such questions, you should always be able to find the exception like that

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