CUET Preparation Today
CUET
-- Mathematics - Section B1
Determinants
If A is a $3 \times 3$ square matrix such that $|A|=2$, then $|3 adj ~A|$ is
108
216
12
6
The correct answer is Option (1) → 108
$|3 adj\,A|=3^3×|A|^{3-2}$
$=27×|A|^2=27×4$
$=108$
