$\int_{0}^{1} \left( \prod_{r=1}^{n} (x+r) \right) \left( \sum_{k=1}^{n} \frac{1}{x+k} \right) dx$ નું મૂલ્ય શું થાય?

  • A
    $n$
  • B
    $n!$
  • C
    $(n+1)!$
  • D
    $n \cdot n!$

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