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Fifty Lectures for Mathcounts Competitions (3)
Each lecture includes (1) Basic skills with examples, and (2) Exercises with answer keys. Solutions to all practice problems can be found here:
http://www.amazon.com/Lectures-Mathcounts-Competitions-Solution-Manual/dp/1530806534 Training class is offered: http://www.mymathcounts.com/Copied-2014-Summer-Mathcounts-Training-Program.php