Find the sum r=1∑nr2nCr−1nCr .

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Find the sum {_{{{r}={1}}}^{{n}}}{r}^{{2}}{{^{n}{C}_{{r}}}}{{^

Question

Find the sum $r = 1 \sum n r^{2} \frac{^{n} C _{r}}{^{n} C _{r - 1}}$ .

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Find the sum

r = 1 \sum n r^{2} \frac{^{n} C _{r}}{^{n} C _{r - 1}}

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Question Text

Find the sum

r = 1 \sum n r^{2} \frac{^{n} C _{r}}{^{n} C _{r - 1}}