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If lim(x -> oo) (1 + a/x + b/x^2)^(2x)=...

If `lim_(x -> oo) (1 + a/x + b/x^2)^(2x)= e^2` then the values of a and b, are

A

`a in R, b in R`

B

`a=a, b in R`

C

`a in R, b=2`

D

`a=1,b=2`

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