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Problem
Problem
If
A
A
A
is a
2
×
2
2 \times 2
2
×
2
non singular matrix, then
adj
(
adj
A
)
\text{adj}(\text{adj } A)
adj
(
adj
A
)
is equal to : (a)
A
2
A^2
A
2
(b)
A
A
A
(c)
A
−
1
A^{-1}
A
−
1
(d)
(
A
−
1
)
2
(A^{-1})^2
(
A
−
1
)
2
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