1.

If 1,alpha,alpha^(2),.......,alpha^(n-1) are the n^(th) roots of unity, then sum_(i=1)^(n-1)(1)/(2-alpha^(i)) is equal to:

Answer»

`((N-2)2^(n-1)+1)/(2^(n)-1)`
`(n-2)2^(n)`
`((n-2).2^(n-1))/(2^(n)-1)`
NONE of these

Answer :A


Discussion

No Comment Found

Related InterviewSolutions