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UPSC NDA I 2010 Mathematics Paper
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© examsnet.com
Question : 2
Total: 120
Let
A
=
[
1
2
3
4
]
=
[
a
i
j
]
, where
i
,
j
,
=
1
,
2
. If its inverse matrix is
[
b
i
j
]
, what is
b
22
?
−
2
1
3
2
−
1
2
Validate
Solution:
|
A
|
=
4
−
6
=
−
2
A
−
1
=
[
b
ij
]
=
1
−
2
[
4
−
2
−
3
1
]
=
[
−
2
1
3
2
−
1
2
]
∴
b
22
=
−
1
2
© examsnet.com
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