- #1
ritwik06
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Homework Statement
If [tex]\sum^{n}_{r=0} \frac{1}{^{n}C_{r}} = a[/tex], then find the value of [tex]\sum^{n}_{r=0} \frac{r}{^{n}C_{r}}[/tex] in terms of a and n.[/tex]
The Attempt at a Solution
I tried to write down the terms of both the series, but to no avail. i can't think of anything.Please shed some light.