if a,b,c,d are greater than 0, than prove that a/(b+c) + b/(c+d) + c/(a+d) d/(a+b) is always greater than or equal to 2.

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Originally Posted by geniusgarvil if a,b,c,d are greater than 0, than prove that a/(b+c) + b/(c+d) + c/(a+d) d/(a+b) is always greater than or equal to 2. Please show some of your own effort on this problem.