Discussion Forum
Que.  Let V1 = 2I – J + K and V2 = I + J – K, then the angle between V1 & V2 and a vector perpendicular to both V1 & V2 shall be : 
a.  90 degrees and (–2I + J – 3K) 
b.  60 degrees and (2I + J + 3K) 
c.  90 degrees and (2I + J – 3K) 
d.  90 degrees and (–2I – J + 3K) 
Answer:90 degrees and (–2I – J + 3K)
