MathDB
Three variables, cyclic

Source: Zhautykov Olympiad, Kazakhstan 2008, Question 6

January 18, 2008
inequalitiesinvariantthree variable inequality

Problem Statement

Let a,b,c a, b, c be positive integers for which abc \equal{} 1. Prove that \sum \frac{1}{b(a\plus{}b)} \ge \frac{3}{2}.