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[ 15.If a circle C passing through the p...

[ 15.If a circle C passing through the point (4,0) touches the circle x^(2)+y^(2)+4x-6y=12 externally at the point (1,-1) ,then the radius of C is: [ (1) sqrt(57), (2) 4, (3) 2sqrt(5), (4) 5]]

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