The shortest distance from the plane 12x+4y+3z=327 to the sphere x2+y2+z2+4x−2y−6z=155 is

Shortest distance =perpendicular distance between the plane and sphere                                 =distance of plane from centre of sphere –radius                                =|−2×12+4×1+3×3−327144+9+16|−4+1+9+155                                =26−13=13