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Mathematics
If A and B are square matrices of order 3, then
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Q. If $A$ and $B$ are square matrices of order $3,$ then
Matrices
A
$\operatorname{adj}(A B)=\operatorname{adj} A+\operatorname{adj} B$
10%
B
$(A+B)^{-1}=A^{-1}+B^{-1}$
10%
C
$A B=O \Rightarrow|A|=0$ or $|B|=0$
70%
D
$A B=O \Rightarrow|A|=0$ and $|B|=0$
10%
Solution:
If $A B=O,$ then either of $A$ and $B$ is necessarily singular.