Find ∑r=1(ar+b) ωr-1 if ω is a complex nth root of unity. – McqOptions

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1.	Find ∑r=1(ar+b) ωr-1 if ω is a complex nth root of unity.
A.	n(n+1)a/2
B.	ωr-1 if ω is a complex nth root of unity.a) n(n+1)a/2b) nb/(1-n)
C.	na/(ω-1)
D.	n(n+1)a/(ω-1)
Answer» D. n(n+1)a/(ω-1)

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