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Mathematics
Mathematics
Problem
Consider
A
=
(
1
2
0
0
1
3
2
−
1
1
)
A=\begin{pmatrix}1&2&0\\0&1&3\\2&-1&1\end{pmatrix}
A
=
1
0
2
2
1
−
1
0
3
1
. The entry in the first row and third column of
A
−
1
A^{-1}
A
−
1
is a)
−
3
8
-\dfrac38
−
8
3
b)
3
8
\dfrac38
8
3
c)
1
4
\dfrac14
4
1
d)
5
16
\dfrac5{16}
16
5
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