A. (3,3,1)

B. (4,-2,-4)

C. (2,2/3,2)

D. (5,0,1)

If the points (3,2,-4) ,(5,4,k), (9,8,-10) are collinear then k=

The locus of a point P such that PA+PB=4 where A=(2,3,4) ,B=(-2,3,4) is

If the orthocenter and the circumcentre of a triangle are (-3,5,2), (6,2,5) then its centroid is

The ends of the hypotenuse of a right angled triangle are (2,0,-3), (0,4,1) then the locus of the third vertex is

The line joining the points (2,3,4) and (4,10,7) intersects the line joining(2,-1,5) and (4, -30,17). Then the coordinates of the point of intersection are