1.

If omega a complex cube root of unity ,then (2-omega)(2-omega^(2))+2(3-omega)(2-omega^2)+........+(n-1)(n-omega)(2-omega^2)=

Answer»

`(N(n-1))/(4)`
`(n(n+1))/(4)`
`(n(n+1)(2n+1))/(4)`
`(n(n+1)(n^+3n+4))/(4)`

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