$\int_{1/5}^{1/2} \frac{\sqrt{x-x^2}}{x^3} dx =$

  • A
    $\frac{21}{2}$
  • B
    $\frac{14}{3}$
  • C
    $\frac{7}{3}$
  • D
    $\frac{7}{2}$

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