Question:
If $A$ is a 3 -rowed square matrix and $|A|=4$ then $\operatorname{adj}(\operatorname{adj} A)=?$
A. $4 \mathrm{~A}$
B. $16 \mathrm{~A}$
C. $64 \mathrm{~A}$
D. none of these
Solution:
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