Question
If $A$ is a $3 \times 3$ matrix such that $|A|=8$, then $|3 A|$ equals
✓
Answer
We have, $|3 A|=3^3|A|=3^3-8$ [Given $|A|=8$ ]
$=27 \cdot 8=216$
$=27 \cdot 8=216$
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