Question:
Mark the tick against the correct answer in the following:
If $\omega$ is a complex root of unity then $\left|\begin{array}{ccc}1 & \omega & \omega^{2} \\ \omega & \omega^{2} & 1 \\ \omega^{2} & 1 & \omega\end{array}\right|=?$
A. 1
B. $-1$
C. 0
D. none of these
Solution:
