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If A and B are two matrices such that A...

If A and B are two matrices such that AB=B and BA=A, then

A

`A^2 = A and B^2 ne B`

B

`A^2 ne A and B^2 = B`

C

`A^2 = A and B^2= B`

D

`A^2 ne A and B^2 ne B`

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