AoPSWiki
Want to learn how to tackle those tough MATHCOUNTS and AMC counting and probability problems? Check out Art of Problem Solving's Introduction to Counting & Probability by David Patrick.

Mathematical Kangaroo

From AoPSWiki

Mathematical Kangaroo, a.k.a. International Mathematical Kangaroo may be the world's largest mathematics competition with students in grades 2-12 (in U.S. grades) competing from many nations around the world.


Resources

Looking for a challenging algebra text? Preparing for MATHCOUNTS or the AMC exams?
Check out Art of Problem Solving's Introduction to Algebra by Richard Rusczyk.
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