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Matrices A and B will be inverse of each...

Matrices A and B will be inverse of each other only if (A) `A B=B A`(B) `A B=B A=0`(C) `A B=0,B A=I`(D) `A B=B A=I`

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x*x^(-1)=1
similarly, B is inverse of A
B*A=I-(1)
A*B=I-(2)
A*B=B*A-I
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