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[" 67.If "alpha!=1" is any "n^(" ih ")" ...

[" 67.If "alpha!=1" is any "n^(" ih ")" root of unity,then "S=1+3 alpha+5 alpha^(2)+...." upto "n" terms,is equal to "],[[" (a) "(2n)/(1)," (b) "-(2n)/(" (b) ")," (c) "(n)/(" (c) ")," (c) "(n)/(" (c) ")]]

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