1.

If 'alpha' be the non-real n^(th) roots of unity, then 1+3alpha+5alpha^2+…...(2n-1)alpha^(n-1) is equal to

Answer»

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

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