A focus of an ellipse is at the origin. The directrix is the line x=4 and the eccentricity is \frac{1}{2}. Then the length of the semi-major axis is

MHT CET 2020 Math Solved Paper

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A focus of an ellipse is at the origin. The directrix is the line x=4 and the eccentricity is ‌

. Then the length of the semi-major axis is

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