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Let P,Q,R be three points on a parabola ...

Let P,Q,R be three points on a parabola `y^2=4ax` , normals at which are concurrent. The centroid of the ΔPQR must lie on

A

(a) a line parallel to the directix

B

(b) the axis of parabola

C

(c) a line of slope 1 passing through vertix

D

(d) none of these

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