JEE Main 2020 (Online) 3rd September Morning ShiftQuestion 1
The lines $\vec r=(\hat i-\hat j)+l(2\hat i+\hat k)$ and $\vec r=(2\hat i-\hat j)+m(\hat i+\hat j-\hat k)$
3D Geometry
Solution
Line 1: $(1+2l,-1,l)$; line 2: $(2+m,-1+m,-m)$. $y$: $-1=-1+m\Rightarrow m=0$. $z$: $l=-m=0$. $x$: $1\ne 2$. No common point: (D).