[" 6.If "1,a(1),a(2),...,a(n-1)" are nth...

[" 6.If "1,a_(1),a_(2),...,a_(n-1)" are nth roots of unity,then "],[(1)/(1-a_(1))+(1)/(1-a_(2))+...+(1)/(1-a_(n-1))" equals "],[[" (a) "(2^(n)-1)/(n)," (b) "(n-1)/(2)],[" (c) "(n)/(n-1)," (d) None of these "]]

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