A) 5/2
B) 3/5
C) 7/3
D) None of these
Correct Answer: D
Solution :
\[\because \]\[a=i+j+k\],\[b=2i-4k,\,c=i+\lambda \,j+3k\]arec oplanar. \\[[a\,b\,c]=0\]\[\Rightarrow \,\,\,\left| \,\begin{matrix} 1 & 1 & 1 \\ 2 & 0 & -4 \\ 1 & \lambda & 3 \\ \end{matrix}\, \right|\,=0\] \[\Rightarrow 4\lambda -\left( 6+4 \right)+2\lambda =0\] Þ \[6\lambda =10\,\,\,\Rightarrow \lambda =\frac{5}{3}\].You need to login to perform this action.
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