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[" 23.The line "2x-y+1=0" is a tangent t...

[" 23.The line "2x-y+1=0" is a tangent to the circle at the "],[" point "(2,5)" and the centre of the circles lies on "x-2y=],[4" .The radius of the circle is "],[[" (a) "3sqrt(5)," (b) "5sqrt(3)," (c) "2sqrt(5)," (d) "5sqrt(2)]]

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