The smallest positive integral value of \( n \) for which \( (1+\sqrt{3 i})^{n / 2} \) is positi...

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The smallest positive integral value of \( n \) for which \( (1+\sqrt{3 i})^{n / 2} \) is positive real, is
(A) 3
(B) 6
(C) 12
(D) undefined
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