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Let 2 2 2 2 y x a b + = 1, a > b be an ellipse, whose eccentricity is 1 2 and the length of the latusrectum is 14 . Then the square of the eccentricity of 2 2 2 2 y x a b − = 1 is :

1. 3 2
2. 5 2
3. 3
4. 7 2

Correct answer: 3 2

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