1.

If 1,alpha,alpha^2,…,alpha^(n-1) are the n^(th) roots of unity show that sum_(r=1)^(n-1)r(alpha_r+alpha_(n-r))=-n.

Answer»


ANSWER :`=N{alpha_1+alpha_2+alpha_3+…....+alpha_(n-1)=n{-1}=-n`


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