1.

For an ellipse with eccentricity 1/2 the centre is at the origin, if one directrix is x=4, then the equation of the ellipse is

Answer»

`3x^(2)+4y^(2)=1`
`3x^(2)+4y^(2)=12`
`4X^(2)+34Y^(2)=1`
`4x^(2)+3y^(2)=12`

ANSWER :B


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