(product)*(summation) under integral??!!

Calculus Level 4

Solve:\(\large\displaystyle\int _{ 0 }^{ 1 }{ \left( \prod _{ r=1 }^{ n }{ (x+r) } \right) \sum _{ k=1 }^{ n }{ \frac { 1 }{ x+k } \text{d}x } } \)

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