A) \[-4\]
B) \[4\]
C) 8
D) \[-8\]
Correct Answer: A
Solution :
The vectors are coplanar \[\left| \begin{matrix} 3 & 1 & -2 \\ 1 & 2 & -3 \\ 3 & \lambda & 5 \\ \end{matrix} \right|=0\] \[\Rightarrow \]\[3(10+3\pi )-1(5+9)-2(\lambda -6)=0\] \[30+9\lambda -14-2\lambda +12=0\Rightarrow 7\lambda +28=0\] \[\lambda =-4\]You need to login to perform this action.
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