MathDB

2

Part of 1991 India Regional Mathematical Olympiad

Problems(1)

A very simple one!!!!

Source: India RMO 1991 Problem 2

10/15/2005
If a,b,c,da,b,c,d be any four positive real numbers, then prove that ab+bc+cd+da≥4. \frac{a}{b} + \frac{b}{c} + \frac{c}{d} + \frac{d}{a} \geq 4.
inequalities