यदि $f(x) = e^{-x} + 2e^{-2x} + 3e^{-3x} + \dots + \infty$ है,तो $\int_{\ln 2}^{\ln 3} f(x) \, dx =$

  • A
    $1$
  • B
    $\frac{1}{2}$
  • C
    $\frac{1}{3}$
  • D
    $\ln 2$

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