If \( \alpha \) is a nonreal cube root of unity then \( \left|\alpha^{n}\right|, n \in Z \), is ...

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If \( \alpha \) is a nonreal cube root of unity then \( \left|\alpha^{n}\right|, n \in Z \), is equal to
(a) 1
(b) 3
(c) 0
(d) none of these
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