easy · GMAT Quant

Which of the following describes the 'Smart Numbers' strategy?

1. Substituting a specific value for a variable when only ratios or percents are required by the question.
2. Using the answer choices to work backward into the question stem in this system in this system.
3. Estimating large numbers to the nearest power of ten to speed up calculation in this system.
4. Memorizing the first ten prime numbers to quickly identify factors in this system in this system.
5. Testing extreme boundaries like zero and negative one in Data Sufficiency in this system in this system.

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