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[" 58.If "omega" be a complex "n^(" th "...

[" 58.If "omega" be a complex "n^(" th ")" root of unity,then "sum_(r=1)^(n)(ar+b)omega^(-1)" is equal to: "],[[" (A) "(n(n+1)a)/(2)," (B) "(nb)/(1-n)],[" (C) "(na)/(a-1)," (D) None "]]

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