1.

If ω ≠ 1 is a cubic root of unity and \(\begin{vmatrix} 1&1&1\\1&-ω^2-1&ω^2\\1& ω^2&ω^7\end{vmatrix}\)= 3k, then k is equal to _______.(a) 1 (b) -l (c) √3i(d) -√3i

Answer»

The correct answer is : (d) -√3i



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