AP EAMCET Engineering 17 Sep 2020 Shift 1 Paper

Section: Mathematics

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Question : 38 of 160

Marks: +1, -0

If 1,α,α2,......,αn−1 are the n-th roots of unity,then

n−1

∑

i=1

1

2−αi

is equal to

(n−2)2n
(n−2)2n−1+1
2n−1
(n−2)2n−1
2n−1
1
(n−2)2n

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