1.

If alpha is an n^(th) root of unity then prove that 1+2alpha+3alpha^2+4alpha^3+….+nalpha^(n-1)=-(n)/(1-alpha)

Answer»

`(N)/(1-alpha)`
`(-n)/(1-alpha)`
`(-n)/((1-alpha)^2)`
`(n)/((1-alpha)^2)`

ANSWER :B


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