1) The equation of the circle passing through the foci of the ellipse x216+y29=1 and having centre at (0,3) is A) x2+y2−6y−7=0 B) x2+y2−6y+7=0 C) x2+y2−6y−5=0 D) x2+y2−6y+5=0 Answer: Option BExplanation:Given equation of ellipse is x216+y29=1 Here, a=4,b=3, e=√1−916⇒√74 ∴ Foci is (±,0)= (±4×√74,0) =(±√7,0) ∴ Radius of the circle, r=√(ae)2+b2=√7+9=√16=4 Now, equation of circle is (x−0)2+(y−3)2=16 ∴ x2+y2−6y−7=0