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The equation of standard ellipse whose e...

The equation of standard ellipse whose eccentricity is `1/2` and distance between the foci is 9, is

A

`x^2/36+(2y^2)/27=1`

B

`x^2/81+(4y^2)/243=1`

C

`x^2/63+(4y^2)/36=1`

D

`x^2/49+y^2/36=1`

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