This is the first book of Math Contest Books Series. The book introduces a powerful problem solving technique - the mass points method. The book can be used by students preparing for math competitions such as Mathcounts, AMC 10/12/AIME.
Second book of Math Contest Books Series:
https://www.amazon.com/Balls-Boxes-Yongcheng-Chen/dp/1540390578
Third book of Math Contest Books Series: The Area Method
https://www.amazon.com/dp/1540856410
Fourth book of Math Contest Books Series: Problem Solving Using Cauchy's Inequality
https://www.amazon.com/dp/1541000285
Fifth book: the Completing Square Method: https://www.amazon.com/dp/1542426626
9th book: Problem Solving Using Auxiliary Lineshttps://www.amazon.com/dp/1975681754
10th book: https://www.amazon.com/Problem-Solving-Using-Vietas-Theorem/dp/1542800056
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