Find the unit vector perpendicular to the plane passing through the points `(1,2,3), (2,-1,1) and (1,2,-4)`.

The vector equation of the plane passing through the points (1,-2,5) , (0,-5,-1) and (-3,5,0) is

The product of the d.r's of a line perpendicular to the plane passing through the points (4,0,0), (0,2,0) and (1,0,1) is

Find a unit vector perpendicular to the plane determined by the points P(1, -1, 2), Q(2,0, -1) and R(0, 2, 1) .

Find the equation of the plane passing through the points (3,-1, 0), (2,1,-1), (-1,2,-5) .