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a+b+c > 3 if ab + bc + ca > a+ b + c - All-Russian MO 1996 Regional (R4) 10.1

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September 23, 2024
algebrainequalities

Problem Statement

Prove that if a,b,ca, b, c are positive numbers and ab+bc+ca>a+b+cab + bc + ca > a+ b + c, then a+b+c>3a + b + c > 3.