Lesson: Simplifying Rational Expressions

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Hi Brent,

I like the approach of testing values! When can I use this approach in particular please.

Thank you for your advice
Best Regards
Fatima-Zahra
gmat-admin's picture

Great question!
Here's an article I wrote that specifically addresses that question: http://www.gmatprepnow.com/articles/data-sufficiency-when-plug-values

Cheers,
Brent

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