1.

If the pair of lines joining the origin and the points of intersection of the line ax +by = 1and the curve x^(2) +y^(2) - x - y - 1 = 0are at right angles , then the locus of he point (a,b) is a circle of radius

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2
`SQRT((3)/(2))`
`sqrt((5)/(2))`
`(sqrt(5))/(2)`

Answer :C


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