S1 and S2, are the foci of an ellipse of major axis of length 10 units, and P is any point on the ellipse such that the perimeter of triangle PS1S2, is 15. Then the eccentricity of the ellipse is

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0.5

0.25

0.28

0.75

answer is A.

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Detailed Solution

2a(1+e)=15or 1+e=32or e=0.5

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