A. 2x2+2y2+6x+17y+6=0

B. 2x2+2y2+6x-17y-6=0

C. x2+y2+6x+15y+5=0

D. none

The locus of the centre of the circles which touché both the circles x^{2}+y^{2}=a^{2} and x^{2}+y^{2}=4ax externally has the equation

The locus of the centre of the circle which cuts the circles x^{2}+y^{2}+4x-6y+9=0 and x^{2}+y^{2}-4x+6y+4=0 orthogonally is

A circle touches the x-axis and also touches the circle with centre at (0, 3) and radius 2. The locus of the centre of the circle is

The pole of the line ax+by+3a^{2}+3b^{2}=0 w.r.t to the circle x^{2}+y^{2}+2ax+2by-a^{2}-b^{2}=0 is

The circle with centre on the line 2x-2y+9=0 and cutting the circles x^{2}+y^{2}=4 orthogonally, passes through the fixed points