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

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Let any double ordinate \( P N P^{\prime} \) of the hyperbola
P
W \( \frac{x^{2}}{25}-\frac{y^{2}}{16}=1 \) be produced both sides to meet the asymptotes is \( Q \) and \( Q^{\prime} \), then \( (P Q)\left(P^{\prime} Q\right) \) is equal to
(1) 9
(2) 16
(3) 25
(4) 41
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