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Q.

The normals at three points P, Q, R of the parabola y2 = 4ax meet in (h, k), the centroid of triangle PQR lies on:

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a

x = -a

b

x = 0

c

y = a

d

y = 0

answer is B.

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Detailed Solution

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Since the centroid of the triangle formed by the conormal points lies on the axis of the parabola.

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The normals at three points P, Q, R of the parabola y2 = 4ax meet in (h, k), the centroid of triangle PQR lies on: