Question:
If $\mathrm{A}$ is an $3 \times 3$ non-singular matrix such that $\mathrm{AA}^{\prime}=\mathrm{A}^{\prime} \mathrm{A}$ and $\mathrm{B}=\mathrm{A}^{-1} \mathrm{~A}^{\prime}$, the $\mathrm{BB}^{\prime}$ equals :
Correct Option: , 2
Solution:
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