A. x2+y2+z2-2x-4y+2z-3=0

B. x2+y2+z2+2x+4y+2z+3=0

C. x2-y2-z2-2x-4y+2z-3=0

D. x2+y2-z2+2x+4y+2z-3=0

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

The circumradius of the triangle formed by the points (2,-1,1) , (1,-3,-5), (3,-4,-4) is

The orthocentre of the triangle formed by the points(2,-1,1), (1,-3,-5), (3,-4,-4) is

The points of trisection of the line segment joining (2,-3,5), (3,1,-2) are

If the origin is the centroid of the tetrahedron for which (2,-1,3), (-1,3,1), (3,4,-2) are three vertices then the fourth vertex is