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If (2,4) and (10,10) are the ends of a l...

If (2,4) and (10,10) are the ends of a latus rectum of an ellipse with the eccentricity `1/2`, then the length of semi-major axis is:

A

`20/3`

B

`15/3`

C

`40/3`

D

None of these

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