[" 1.The locus of the centre of the circ...

[" 1.The locus of the centre of the circles which both the circles "x^(2)+y^(2)=a^(2)" and "],[x^(2)+y^(2)=4ax" externally is "],[[" (A) a circle "," (B) a parabola "],[" (C) an ellipse "," (D) a hyperbola "]]

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