If \( P \equiv(x, y), F_{1} \equiv(3,0), F_{2} \equiv(-3,0) \) and ...

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If \( P \equiv(x, y), F_{1} \equiv(3,0), F_{2} \equiv(-3,0) \) and
\( \mathrm{P}^{17:} \) \( 16 x^{2}+25 y^{2}=400 \), then \( P F_{1}+P F_{2} \) equals:

W
(1) 8
(2) 6
(3) 10
(4) 12
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