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If the straight lines joining origin to the points of intersection of the line x+y=1 with the curve `x^2+y^2 +x-2y -m =0 ` are perpendicular to each other , then the value of m should be

A

`-1/2`

B

0

C

`1/2`

D

1

Text Solution

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The correct Answer is:
A
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