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[" 1.If a circle "C" passing through the...

[" 1.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 "],[[" (a) "sqrt(57)," (b) "5," (c) "2sqrt(5)," (d) "4]]

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