The ratio in which yz–plane divide the line joining the points A(3, 1, –5) and B(1, 4, –6) is

–3 : 1 3 : 1 –1 : 3 1 : 3

–3 : 1

A ≡ (3, 1, − 5), B ≡ (1, 4, − 6) Therefore $\frac{3+\lambda}{\lambda+1}=0 \Rightarrow \lambda=-3$ Therefore required ratio is −3 : 1