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[" Let "y^(2)=4ax" be a parabola and "x^(2)+y^(2)+2bx=0" be a circle.If parabola and circle thouch each other "],[" extermally then : "],[[" (a) "a>0,b>0," (b) "a>0,b<0," (c) "a<0,b>0," (d) "a<0,b<0]]

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