Let A(2, 1, -3) a

The coordinates of point R that divides the line segment joining points P (x₁, y₁, z₁)

and Q (x₂, y₂, z₂) in the ratio m: n are

Point A( 2, 1, -3 ) and B( 5, -8, 3 ), m and n are 2 and 1 respectively.

Using the above formula, we get,

( 4,-5, 1), is the point of trisection of the segment AB.