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If ax+b/x >= c for all positive x, wh...

If `ax+b/x >= c` for all positive x, where ` a, b, c > 0,` then-

A

`27ab^(2)ge4c^(3)`

B

`27ab^(2)le4c^(3)`

C

`9ab^(2)ge4c^(2)`

D

`9ab^(2)le4c^(2)`

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