If y=xand2x+3y=0 are equations of a pair...

If `y=xand2x+3y=0` are equations of a pair of conjugate diameters of an ellipse, then its eccentricity is :

`(1)/(sqrt(3))`

`(1)/(sqrt(2))`

`sqrt((2)/(3))`

`(2)/(sqrt(5))`

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