JEE Advance - Mathematics (1995 - No. 16)
The radius of the circle passing through the foci of the ellipse $${{{x^2}} \over {16}} + {{{y^2}} \over 9} = 1$$, and having its centre at $$(0, 3)$$ is
$$4$$
$$3$$
$$\sqrt {{1 \over 2}} $$
$${{7 \over 2}}$$