MCQ
જો સમીકરણ સંહતિ $\lambda x+2y-2z=1,4x+2\lambda y-z=2,6x+6y+\lambda z=3$ ને અનન્ય ઉકેલ હોય તો $\lambda $
$.....$
- A8
- B9
- ✓2
- D4
$\therefore\begin{vmatrix}\lambda & 2 & -2 \\4 & 2\lambda & -1 \\6 & 6 & \lambda\end{vmatrix}$
$0$
$\therefore \lambda(2\lambda^2+6)-2(24-12\lambda)$
$0$
$\therefore \lambda$
$2$
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