[MP PET 1987]
A) $ \sqrt{2} $
B) $ 1/\sqrt{2} $
C) 2
D) $ 1+\sqrt{2} $
Correct Answer: A
$ \frac{x^{2}}{25}-\frac{y^{2}}{25}=1 $ . Eccentricity $ =\sqrt{2} $ as $ a=b $ .
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