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Preparing for MATHCOUNTS or the AMC contests, and having a tough time with number theory problems? Read Art of Problem Solving's Introduction to Number Theory by Mathew Crawford.
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0.99... to 2003 AMC 10A Problems/Problem 13
2003 AMC 10A Problems/Problem 14 to 2007 AMC 12B Problems/Problem 13
2007 AMC 12B Problems/Problem 14 to Factoring
Fallacious proof to Proper fraction
Proportion to Zorn's Lemma
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Want to learn how to tackle those tough AMC/AIME/Olympiad counting and probability problems? Check out Art of Problem Solving's NEW Intermediate Counting & Probability by David Patrick.
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