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If A B=A and B A=B , where A and B are s...

If `A B=A` and `B A=B` , where `A` and `B` are square matrices, then `B^2=B` and `A^2=A` (b) `B^2!=B` and `A^2=A` (c) `A^2!=A` , `B^2=B` (d) `A^2!=A` , `B^2!=B`

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