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Question

If A=⎡⎢⎣0c−b−c0ab−a0⎤⎥⎦ and B=⎡⎢⎣a2abacbab2bccacbc2⎤⎥⎦ then AB is equal to

A
[0]
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B
I
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C
2I
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D
none of these
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Solution

The correct option is B [0]
A=0cbc0aba0 and B=a2abacbab2bccacbc2
Now, AB=0cbc0aba0a2abacbab2bccacbc2
AB=000000000

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