The equation of the sphere is x2+y2+z2−6x−12y−2z+20=0
So, the centre of the sphere is (−u,−v,−w)=(3,6,1) given the one end of the diameter is ( 2,3,−3), let the other end of the diameter is (α,β,γ). Since, O is the mid point of the diameter, then (3,6,1)=[