\( l x+m y=1 \) is the equation of the chord \( P Q \) of \( y^{2}=...

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\( l x+m y=1 \) is the equation of the chord \( P Q \) of \( y^{2}=4 x \)
\( \mathrm{P} \) whose focus is \( S \). If \( P S \) and \( Q S \) meet the parabola

W again at \( R \) and \( T \) respectively, then slope of \( R T \) is:
(1) \( -\frac{1}{m} \)
(2) \( \frac{1}{m} \)
(2) \( \frac{2}{m} \)
(4) None of these
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