\( P \) is any point on the ellipse \( 81 x^{2}+144 y^{2}=1944 \) P...

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\( P \) is any point on the ellipse \( 81 x^{2}+144 y^{2}=1944 \)
P whose foci are \( S \) and \( S \), then \( S P+S^{\prime} P= \)

W
(1) 3
(2) \( 4 \sqrt{6} \)
(3) 36
(4) 324
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