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If alpha is an imaginary cube root of un...

If `alpha` is an imaginary cube root of unity,then for `n in N`, the value of `(alpha)^(3n+1)+(alpha)^(3n+3)+(alpha)^(3n+5)` is

A

`A.-1`

B

`B.0`

C

`C.1`

D

`D.3`

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