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`1,alpha_1,alpha_2,alpha_3…..alpha_(n-1)` are the `n^(th)` roots of unity and n is an even natural number ,then `(1+alpha_1)(1+alpha_2)(1+alpha_3)….(1+alpha_(n-1))=`

A

only I is true

B

only II is true

C

both I and II are true

D

neither I nor II true

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