" 20.The length of common chord of the ellipse "((x-1)^(2))/(9)+((y-2)^(2))/(4)=1" and the circle "(x-1)^(2)+(y-2)^(2)=1" is "

The length of the common chord of the ellipse ((x-1)^(2))/(9)+((y-2)^(2))/(4)=1 and the circle (x-1)^(2)+(y-2)^(2)=1 is (A)2(B)sqrt(3)(C)4 (D) none of these

The length of the common chord of the ellipse ((x-1)^2)/9+((y-2)^2)/4=1 and the circle (x-1)^2+(y-2)^2=1 is (A) 2 (B) sqrt3 (C) 4 (D) none of these

The length of the common chord of the ellipse ((x-1)^2)/9+((y-2)^2)/4=1 and the circle (x-1)^2+(y-2)^2=1 is (A) 2 (B) sqrt3 (C) 4 (D) none of these

The slope of a common tangent to the ellipse (x^(2))/(49) + (y^(2))/(4) =1 and the circle x^(2) + y^(2) = 16 is

Number of common tangents of ellipse ((X-2)^(2))/(9)+((y+2)^(2))/(4)=1 and the circle x^(2)+y^(2)-4x+2y+4=0 is

The number of common tangents to the ellipse (x^(2))/(16) + (y^(2))/(9) =1 and the circle x^(2) + y^(2) = 4 is