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If S=a1+a2+......+an,ai in R^+ for i=1 ...

If `S=a_1+a_2+......+a_n,a_i in R^+` for i=1 to n, then prove that `S/(S-a_1)+S/(S-a_2)+......+S/(S-a_n) ge n^2/(n-1), AA n ge 2`

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