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

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 semimajor axis is (1) `8/3` (2) `2/3` (3) `4/3` (4) `5/3`

A

`8/3`

B

`2/3`

C

`4/3`

D

`5/3`

Text Solution

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The correct Answer is:
A
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