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If omega ne1 is a cube root of unity the...

If `omega ne1` is a cube root of unity then the sum of the series `S=1+2omega+3omega^2+….+3nomega^(3n-1)` is

A

`3n/(omega-1)`

B

`3n(omega-1)`

C

`(omega-1)/3n`

D

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The correct Answer is:
A
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