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WBJEE 2015 Math Solved Paper
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© examsnet.com
Question : 10
Total: 80
If A and B are two matrices such that AB = B and BA = A, then
A
2
+
B
2
equals
2AB
2BA
A + B
AB
Validate
Solution:
A.A + B.B = A (BA) + B (AB) = BA + AB = A + B
© examsnet.com
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