The normal at three points \( P, Q, R \) of the parabola P \( y^{2}...

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The normal at three points \( P, Q, R \) of the parabola
P \( y^{2}=4 a x \) meet in \( (h, k) \). The centroid of triangle
\( \mathrm{W} \) \( P Q R \) lies on
(1) \( x=0 \)
(2) \( y=0 \)
(3) \( x=-\mathrm{a} \)
(4) \( \quad \) a
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