Q.

If e is the eccentricity of an ellipse whose conjugate diameters are y = x and 3y = –2x then 3e2 =

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answer is 1.

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Detailed Solution

For conjugate diametre m1m2=-b2a2 where m1 and m2 are slopes of the respective diameters (1)(-23)=-b2a2 b2=23a2 a2(1-e2)=23a2 (1-e2)=23 3-3e2=2 3e2=1
 

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