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Equation x^(n)-1=0, ngt1, n in N," has r...

Equation `x^(n)-1=0, ngt1, n in N," has roots "1,a_(1),a_(2),…,a_(n-1).`
The value of `overset(n-1)underset(r=1)sum(1)/(2-a_(r))` is

A

`(2^(n-1).(n-2)+1)/(2^(n)-1)`

B

`(2^(n).(n-2)+1)/(2^(n)-1)`

C

`(2^(n-1).(n-2)-1)/(2^(n)-1)`

D

None of these

Text Solution

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The correct Answer is:
A
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