If the co-ordinates of two points \( A \) and \( B \) are \( \mathr...

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If the co-ordinates of two points \( A \) and \( B \) are
\( \mathrm{P} \) \( (\sqrt{7}, 0) \) and \( (-\sqrt{7}, 0) \) respectively and \( P \) is any

W point on the conic, \( 9 x^{2}+16 y^{2}=144 \), then \( P A+P B \) is equal to
(1) 8
(2) 9
(3) 16
(4) 6
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