MCQ
Solve $|x\,-\,2| + |x\,-\,1| = x\,-\,3$
- A$[1, 2]$
- B$(1,2)$
- C$( - \infty ,1) \cup (2,\infty )$
- ✓None
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$A=\left(\begin{array}{ccc}\beta & 0 & 1 \\ 2 & 1 & -2 \\ 3 & 1 & -2\end{array}\right)$
If $A^7-(\beta-1) A^6-\beta A^5$ is a singular matrix, then the value of $9 \beta$ is