If alpha is the nth root of unity, then...

If `alpha` is the nth root of unity, then `1+2alpha+3alpha^2+ ton` terms equal to a.`(-n)/((1-alpha)^2)` b. `(-n)/(1-alpha^2)` c. `(-2n)/(1-alpha)""` d. `(-2n)/((1-alpha)^2)`

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