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If omega is an imaginary x^n root of uni...

If `omega` is an imaginary `x^n` root of unit then `underset(r=1)oversetnsum(ar+b)omega^(r-1)` is

A

`n(n+1)a/omega`

B

nb/(1-n)

C

`na/(omega-1)`

D

none of these

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The correct Answer is:
C
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