MCQ
The area bounded by the lines $|x| + |y| = 1$ is:
- A$\text{1 sq. unit}$
- ✓$\text{2 sq. units}$
- C$2\sqrt{2}\text{ sq}.\text{units}$
- D$\text{4 sq. units}$
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$(1)$ $a+b=3$
$(2)$ $\operatorname{det}\left(\operatorname{adj} M ^2\right)=81$
$(3)$ $(\operatorname{adj} M)^{-1}+\operatorname{adj} M^{-1}=-M$
$(4)$ If $M \left[\begin{array}{l}\alpha \\ \beta \\ \gamma\end{array}\right]=\left[\begin{array}{l}1 \\ 2 \\ 3\end{array}\right]$, then $\alpha-\beta+\gamma=3$