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[" 40.If "alpha" is an nth root of unity...

[" 40.If "alpha" is an nth root of unity,then "1+2 alpha+3 alpha^(2)+.....n alpha^(n-1)=],[[" 1) "(n)/(1-alpha)," 2) "(-n)/(1-alpha)," 3) "(-n)/((1-alpha)^(2))," 4) "(-n^(2))/(1-alpha)]]

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