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[" Let "y^(2)=4ax" be a parabola and "x^...

[" Let "y^(2)=4ax" be a parabola and "x^(2)+y^(2)+2bx=0" be a circle.If parabola and "],[" circle touch each other externally,then "],[[" a."ab>0," b."a>0,b<0],[" c."a<0,b>0," d.None of these "]]

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