If the major axis of an ellipse is three times the minor axis, then its eccentricity is equal to...

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If the major axis of an ellipse is three times the minor axis, then its eccentricity is equal to
(A) \( \frac{1}{3} \)
(B) \( \frac{1}{\sqrt{3}} \)
(C) \( \frac{1}{\sqrt{2}} \)
(D) \( \frac{2 \sqrt{2}}{3} \)
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