Complexity! (7)

Algebra Level 4

Evaluate the following sum in terms of \(n\),

\[\displaystyle \sum_{k=1}^n (k+1)\left(k + \dfrac{1}{\omega}\right)\left(k + \dfrac{1}{\omega^2}\right)\]

Notations: \(\omega\) and \(\omega^2\) are non-real cube roots of unity.


For more problems on complex numbers, click here.

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