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Let f(x)=x((1)/(x-1)+(1)/(x)+(1)/(x+1)),...

Let `f(x)=x((1)/(x-1)+(1)/(x)+(1)/(x+1)), x gt 1`. Then

A

`f(x)le 1`

B

`1 lt f(x)le 2`

C

`2 lt f(x)le 3`

D

`f(x)gt 3`

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