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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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