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

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

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