The eccentricity of an ellipse having centre at the origin, axes along the co-ordinate axes and passing through the points (4, −1) and (−2, 2) is :

Question

${1 \over 2}$

${2 \over {\sqrt 5 }}$

${{\sqrt 3 } \over 2}$

${{\sqrt 3 } \over 4}$

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