1
IIT-JEE 1981
MCQ (Single Correct Answer)
+2
-0.5
The equation $${{{x^2}} \over {1 - r}} - {{{y^2}} \over {1 + r}} = 1,\,\,\,\,r > 1$$ represents
A
an ellipse
B
a hyperbola
C
a circle
D
none of these
JEE Advanced Subjects