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The normals at three points P,Q,R of the...

The normals at three points P,Q,R of the parabola `y^2=4ax` meet in (h.k) . The centroid of `DeltaPQR` lies on

A

x = 0

B

y = 0

C

x = -a

D

y = a

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The correct Answer is:
B
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