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Army Group X Practice Set 3
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© examsnet.com
Question : 56
Total: 70
If
A
=
[
0
0
1
0
1
0
1
0
0
]
,
then
A
−
1
=
?
A
−
A
I
−
I
Validate
Solution:
W e know that,
A
−
I
A
orI
−
A
−
1
A
⇒
[
0
0
1
0
1
0
1
0
0
]
=
[
1
0
0
0
1
0
0
0
1
]
A
⇒
[
1
0
0
0
1
0
0
0
1
]
=
[
0
0
1
0
1
0
1
0
0
]
A
[
∵
R
1
↔
R
3
]
On com p aring w ith
1
=
A
−
1
A
, we get
A
−
1
=
[
0
0
1
0
1
0
1
0
0
]
=
A
© examsnet.com
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