If distance between the directrices be thrice the distance between the foci, then eccentricity of ellipse is
If distance between the directrices be thrice the distance between the foci, then eccentricity of ellipse is
- A
$1\over2$
- B
$2\over3$
- C
$1\over \sqrt 3 $
- D
$4\over5$
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