If \( a_{n}=\sum_{r=0}^{n} \frac{1}{{ }^{n} C_{r}} \) then \( \sum_{r=0}^{n} \frac{r}{{ }^{n} C_...

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If \( a_{n}=\sum_{r=0}^{n} \frac{1}{{ }^{n} C_{r}} \) then \( \sum_{r=0}^{n} \frac{r}{{ }^{n} C_{r}} \) equals
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