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If omega be an imaginary n^(th) root of ...

If `omega` be an imaginary `n^(th)` root of unity , then `sum_(r=1)^(n)(ar+b) omega^(r-1)` is equal to :

A

`(n(n+1)a)/(2omega)`

B

`(nb)/(1-n)`

C

`(na)/(omega-1)`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
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