Let any double ordinate \( P N P^{\prime} \) of the hyperbola \( \f...

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Let any double ordinate \( P N P^{\prime} \) of the hyperbola \( \frac{x^{2}}{25}-\frac{y^{2}}{16} \)
\( \mathrm{P} \) \( =1 \) be produced on both sides to meet the asymptotes in \( Q \)

W and \( Q^{\prime} \). Then \( P Q \cdot P^{\prime} Q \) is equal to
(1) 25
(2) 16
(3) 41
(4) none of these
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