MCQ
For same order square matrix $A , B , C , AB = AC$ $\Rightarrow B=C$, then $A$ will be :
- ANon-invertible matrix
- BNon-zero matrix
- CUnit matrix
- ✓Invertible matrix.
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$(A)$ $M=I$ $(B)$ $\operatorname{det} M =1$ $(C)$ $M ^2= I$ $(D)$ $(\operatorname{adj} M)^2=I$
$0$
$1$
$\frac{\pi}{2}$
$\frac{\pi}{4}$