If a ,b ,c in R^+, t h e n(b c)/(b+c)+(...

If `a ,b ,c in R^+, t h e n(b c)/(b+c)+(a c)/(a+c)+(a b)/(a+b)` is always (a)`lt=1/2(a+b+c)` (b)`geq1/3sqrt(a b c)` (c)`lt=1/3(a+b+c)` (d)`geq1/2sqrt(a b c)`

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