XY-plane divides the line joining the points A(2, 3, -5) and B(-1, -2, -3) in the ratio
Here's the idea in simple terms: we verify 5 ∶ 3 externally by full calculation: use standard identity, substitute, simplify step by step to reach 5 ∶ 3 externally.
Ref: NCERT Mathematics Class XII — Vectors and 3D Geometry
