The value of r=1∑n(−1)r−1(r+1r)⋅nCr is

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The value of $r = 1 \sum n (- 1)^{r - 1} (\frac{r}{r + 1}) \cdot^{n} C_{r}$ is

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r = 1 \sum n (- 1)^{r - 1} (\frac{r}{r + 1}) \cdot^{n} C_{r}

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Question Text

The value of

r = 1 \sum n (- 1)^{r - 1} (\frac{r}{r + 1}) \cdot^{n} C_{r}