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If omega ne 1 is cube root of unity, the...

If `omega ne 1` is cube root of unity, then the sum of the series `S = 1+2omega+3omega^2+….......+3n(omega)^(3n-1)` is

A

`frac{3n}{omega-1}`

B

`3n(0mega-1)`

C

`frac{omega-1}{3n}`

D

0

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