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Give examples of matrices `A` and `B` such that `A B!=B A` . (ii) `A` and `B` such that `A B=O` but `A!=O ,\ B!=O`

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`A=[[1, 0], [0, 0]]` and `B=[[0, 0], [1, 0]]`
`A !=0` and `B!=0`
`AB=[[0, 0], [0, 0]]=0`
`BA=[[0,0], [1, 0]] !=0`
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