Find the sum of r=1∑nnCr−1rnCr .

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Find the sum of {_{{{r}={1}}}^{{n}}}{{{r}^{{n}}{C}_{{r}}}}{{^{

Question

Find the sum of $r = 1 \sum n \frac{r ^{n} C _{r}}{^{n} C _{r - 1}}$ .

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Find the sum of

r = 1 \sum n \frac{r ^{n} C _{r}}{^{n} C _{r - 1}}

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Question Text

Find the sum of

r = 1 \sum n \frac{r ^{n} C _{r}}{^{n} C _{r - 1}}