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The value of the expression (1+1/omega)...

The value of the expression `(1+1/omega)(1+1/omega^(2))+(2+1/omega)(2+1/omega^(2))+(3+1/omega)(3+1/omega^(2))+…………..+(n+1/omega)(n+1/omega^(2))`, where `omega` is an imaginary cube root of unity, is

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