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If a,b,c are positive then which of the ...

If a,b,c are positive then which of the following holds good?(A) `b^c^2 +c^2a^2 +a^2b^2 ge abc(a+b+c)`(B) `(bc)/a+(ca)/b+(ab)/c ge a+b+c` ((C) `(bc)/a^3 +ca/b^3 + ab/c^3 ge 1/a+1/b+1/c`(D) `1/a+1/b+1/c ge 1/(sqrt(bc))+1/(sqrt(ca))+1/sqrt(ab))`

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