If the length of the major axis of an ellipse is three times the length of its minor axis, then its eccentricity is
If the length of the major axis of an ellipse is three times the length of its minor axis, then its eccentricity is
- A
$\frac{1}{3}$
- B
$\frac{1}{{\sqrt 3 }}$
- C
$\frac{1}{{\sqrt 2 }}$
- D
$\frac{{2\sqrt 2 }}{3}$
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