If A is a 2 2 matrix such that A(adj A)= [ ll 5 & 0 0 & 5 ], then… - Vidyadip

MCQ

If $A$ is a $2 \times 2$ matrix such that $A(\operatorname{adj} A)=\left[\begin{array}{ll}5 & 0 \\ 0 & 5\end{array}\right]$, then $|A|=$

A
$0$
✓
5
C
10
D
25

✓

Answer

Correct option: B.

5

(b) 5
Hint:
$A(\operatorname{adj} A)=|A| . \mid$

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