Mark (√) against the correct answer in each of the following:
It is given that the vectors 
and 
are coplanar. Then, the value of λ is
Given – The vectors 
are coplanar
To find – The value of λ
Formula to be used - 
where 
and 
Tip – For vectors to be coplanar, 
Hence,
⇨ 4(λ-1)+8(λ-1)=0
⇨ 12(λ-1)=0 i.e. λ= 1
1