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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.

Talk:Arithmetic mean

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Do we need the center? It adds a bunch of extra space. Wouldn't just putting it on its own line be effective?--IntrepidMath 12:14, 22 June 2006 (EDT)

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