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If 1,alpha1, alpha2, …alpha(n-1) be nth...

If `1,alpha_1, alpha_2, …alpha_(n-1)` be nth roots of unity then `(1+alpha_1)(1+alpha_2)……....(1+alpha_(n-1))=` (A) 0 or 1 according as n is even or odd (B) 0 or 1 according as n is odd or even (C) n (D) `-n`

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