Find a unit vector in the direction from point `p(1,-1,2)`to point `Q(-1,1,1)`

Find a unit vector in the direction from : P(1,2) towards Q(4,5).

Find the unit vector in the direction of vector vec PQ ,P(1,2,3) and Q(5,6,7 )

find the unit vector in the direction of 'PQ' where P and Q are the points (1,2,3) and (4,5,6).

Find the unit vector in the direction of the vector whose initial point is P(4,5) and terminal point is Q(-2, 13)

Find a unit vector normal to the plane through the points (1, 1, 1), (-1, 2, 3) and (2, -1, 3) .

Find a unit vector normal to the plane through the points (1, 1, 1), (-1, 2, 3) and (2, -1, 3) .

Find a unit vector normal to the plane through the points (1, 1, 1), (-1, 2, 3) and (2, -1, 3) .

Find the unit vector in the direction of vector overline(PQ) , where P and Q are the points P=(1,2,3).Q=(4,5,6) respectively.