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Problem
Problem
For any
2
×
2
2 \times 2
2
×
2
matrix
A
A
A
, if
A
(
adj
A
)
=
[
10
0
0
10
]
A(\text{adj } A) = \begin{bmatrix} 10 & 0 \\ 0 & 10 \end{bmatrix}
A
(
adj
A
)
=
[
10
0
0
10
]
, then
∣
A
∣
|A|
∣
A
∣
is equal to a. 0 b. 10 c. 20 d. 100
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