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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 semi-major axis is- "],[[" (1) "8/3," (2) "2/3," (AIEEE-2008] "]]

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