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Mathematics
Problem
Let
A
=
[
1
−
2
−
1
0
4
−
1
−
3
2
1
]
A = \begin{bmatrix} 1 & -2 & -1 \\ 0 & 4 & -1 \\ -3 & 2 & 1 \end{bmatrix}
A
=
1
0
−
3
−
2
4
2
−
1
−
1
1
,
B
=
[
−
2
−
5
−
7
]
B = \begin{bmatrix} -2 \\ -5 \\ -7 \end{bmatrix}
B
=
−
2
−
5
−
7
,
C
=
[
9
8
7
]
C = [9 \ 8 \ 7]
C
=
[
9
8
7
]
, which of the following is defined ? (A) Only AB (B) Only AC (C) Only BA (D) All AB, AC and BA
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