If \( A \) and \( B \) are two fixed points and \( P \) is a variab...

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If \( A \) and \( B \) are two fixed points and \( P \) is a variable
\( \mathrm{P} \) point that \( P A+P B=4 \), the locus of \( P \) is

W
(1) Parabola
(2) Ellipse
(3) Hyperbola
(4) None of these
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