If $\lim _{n \rightarrow \infty} x_n$ exists and is finite,$x_1=2$,$x_{n+1}=\frac{a+b x_n}{b+c x_n}$ for all $n \in N$,and $c > b > a > 0$,then $\lim _{n \rightarrow \infty} x_n =$

  • A
    $\sqrt{\frac{a b}{c}}$
  • B
    $\sqrt{\frac{a}{c}}$
  • C
    $\sqrt{\frac{a}{b}}$
  • D
    $\sqrt{\frac{a}{b}}$

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