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If f(x)=x/(x-1), then (fofofo......of...

If `f(x)=x/(x-1)`, then `(fofofo......of)(x)` is equal to

A

`(x)/(x-1)`

B

`((x)/(x-1))^(19)`

C

`(19x)/(x-1)`

D

x

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A
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