If \( \left(\frac{1+i \sqrt{3}}{1-i \sqrt{3}}\right)^{n} \) is an integer, then \( n \) is (A) 1...

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If \( \left(\frac{1+i \sqrt{3}}{1-i \sqrt{3}}\right)^{n} \) is an integer, then \( n \) is
(A) 1
(B) 3
(C) 2
(D) 4
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