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A focus of an ellipse is at the origin. ...

A focus of an ellipse is at the origin. The directrix is the line `x =4` and the eccentricity is `1/2` Then the length of the semi-major axis is

A

`2//3`

B

`4//3`

C

`5//3`

D

`8//3`

Text Solution

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The correct Answer is:
D
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