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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.
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Supplementary

From AoPSWiki

Supplementary is a term which can have many meanings. In mathematics it is most commonly used in geometry: two angles are said to be supplementary if they sum to radians (180 degrees).

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.
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