The value of the sum \( \sum_{r=1}^{n} \frac{\mathrm{r}^{n} C_{r}}{{ }^{n} C_{r-1}} \) is....

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The value of the sum \( \sum_{r=1}^{n} \frac{\mathrm{r}^{n} C_{r}}{{ }^{n} C_{r-1}} \) is
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(1) \( \frac{n(n-1)}{2} \)
(2) \( \frac{n(n+1)}{2} \)
(3) \( n(n-1) \)
(4) None of these


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