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The equation of diameter of a circle pas...

The equation of diameter of a circle passing through origin is `x+y=1` and the greatest distance of any point of the circle from the diameter is `sqrt(5)` , then an equation of the circle is: (A)`x^2+y^2-2x+4y=0` (B) `x^2+y^2-4x+2y=0` (C) `x^2+y^2+2x-2y=0` (D) none of these

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