Let $f(x) = \sqrt {x - 1} + \sqrt {x + 24 - 10\sqrt {x - 1} ;} $ $1 < x < 26$ be real valued function. Then $f\,'(x)$ for $1 < x < 26$ is

  • A

    $0$

  • B

    ${1 \over {\sqrt {x - 1} }}$

  • C

    $2\sqrt {x - 1} - 5$

  • D

    None of these

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