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Let any double ordinate `P N P '` of the hyperbola `(x^2)/(25)-(y^2)/(16)=1` be produced on both sides to meet the asymptotes in `Q` and `Q '` . Then `P Q.P^(prime)Q` is equal to
(a) 25 (b) 16 (c) 41 (d) none of these

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