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Mathematics
Problem
State the necessary and sufficient condition for a
2
×
2
2\times 2
2
×
2
matrix
A
A
A
to be invertible. a)
det
(
A
)
=
1
\det(A)=1
det
(
A
)
=
1
b)
a
d
≠
0
ad\neq 0
a
d
=
0
c)
det
(
A
)
≠
0
\det(A)\neq 0
det
(
A
)
=
0
d)
det
(
A
)
=
0
\det(A)=0
det
(
A
)
=
0
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