यदि ${I_n} = \int_0^\infty {{e^{ - x}}{x^{n - 1}}dx,} $ है,तो $\int_0^\infty {{e^{ - \lambda x}}{x^{n - 1}}dx = } $

  • A
    $\lambda {I_n}$
  • B
    $\frac{1}{\lambda }{I_n}$
  • C
    $\frac{{{I_n}}}{{{\lambda ^n}}}$
  • D
    ${\lambda ^n}{I_n}$

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