If the length of the major axis of an ellipse is three P times the ...

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If the length of the major axis of an ellipse is three
P times the length of its minor axis, its eccentricity, is

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(1) \( \frac{1}{3} \)
(2) \( \frac{1}{\sqrt{3}} \)
(3) \( \frac{1}{\sqrt{2}} \)
(4) \( \frac{2 \sqrt{2}}{3} \)
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