qc strategies - picking numbers
summary
the strategy of picking numbers in gre quantitative comparison questions is a nuanced technique that involves selecting specific values to test the relationships between quantities, especially when variables are involved. this approach has its strengths and limitations, requiring a blend of strategic selection and logical analysis to effectively determine the correct answer.
- picking numbers is particularly effective for questions involving variables in both answer choices or when comparing a variable to a number with an algebraic expression.
- this strategy can definitively identify 'd' (the quantities cannot be determined) as the correct answer when different numbers yield different relationships between the quantities.
- picking numbers alone cannot always definitively determine the answer; logical and mathematical reasoning is often required to ascertain whether 'a', 'b', or 'c' is correct.
- it's crucial to consider different categories of numbers when picking numbers, including positive, negative, integers, fractions, and decimals, to ensure a comprehensive analysis.
- the art of picking numbers well involves not just random selection but thoughtful consideration of the mathematical situation to guide the choice of numbers.
chapters
00:01
introduction to picking numbers
02:39
efficiency and limitations of picking numbers
06:26
strategic selection and logical analysis
10:01
the art of picking numbers
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