If \( \alpha \) is the \( n^{\text {th }} \) root of unity, then \( 1+2 \alpha+3 \alpha^{2}+\ldo...
If \( \alpha \) is the \( n^{\text {th }} \) root of unity, then \( 1+2 \alpha+3 \alpha^{2}+\ldots \) to \( n \) terms equal to
(a) \( \frac{-n}{(1-\alpha)^{2}} \)
(b) \( \frac{-n}{1-\alpha} \)
(c) \( \frac{-2 n}{1-\alpha} \)
(d) \( \frac{-2 n}{(1-\alpha)^{2}} \)
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