A) 0
B) 1
C) \[-1\]
D) None of these
Correct Answer: A
Solution :
\[1+\omega +{{\omega }^{2}}+.....+{{\omega }^{n-1}}=\left( \frac{{{\omega }^{n}}-1}{\omega -1} \right)=0\], \[(\because {{\omega }^{n}}=1)\]
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