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UPSC NDA I 2012 Mathematics Paper
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© examsnet.com
Question : 11
Total: 120
A
and
B
are two matrices such that
AB
=
A
and
BA
=
B
then what is
B
2
equal to?
B
A
I
−
I
where
I
is the identity matrix
Validate
Solution:
AB
=
A
BA
=
B
ABA
=
A
© examsnet.com
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