olymmath

JBMO 2012 Problem 1

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Let a,ba, b and cc be positive real numbers such that a+b+c=1a+b+c=1. Prove that

ab+ba+bc+cb+ca+ac+6≥22(1−aa+1−bb+1−cc)\frac{a}{b}+\frac{b}{a}+\frac{b}{c}+\frac{c}{b}+\frac{c}{a}+\frac{a}{c}+6 \geq 2 \sqrt{2}\left(\sqrt{\frac{1-a}{a}}+\sqrt{\frac{1-b}{b}}+\sqrt{\frac{1-c}{c}}\right)

When does equality hold?

Dataset text NuminaMath olympiads. Quoted with source.

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a=b=c=\frac{1}{3}

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