If \( \omega \) is an imaginary \( x^{n} \) root of unitythen \( \sum_{r=1}^{n}(a r+b) \omega^{r...
If \( \omega \) is an imaginary \( x^{n} \) root of unitythen \( \sum_{r=1}^{n}(a r+b) \omega^{r-1} \) is
(a) \( \frac{n(n+1) a}{2 \omega} \)
(b) \( \frac{n b}{1-n} \)
(c) \( \frac{n a}{\omega-1} \)
(d) \( \frac{n a}{1-n} \)
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