If $\alpha $ and $\beta $ are different complex numbers with $|\beta | = 1$, then $\left| {\frac{{\beta - \alpha }}{{1 - \overline \alpha \beta }}} \right|$ is equal to

  • [IIT 1992]
  • A

    $0$

  • B

    $3$

  • C

    $1$

  • D

    $2$

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  • [AIEEE 2003]

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