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[" 11."," If "AB=BA" and "A=[[1,1],[0,1]...

[" 11."," If "AB=BA" and "A=[[1,1],[0,1]]],[" ,then "B=," b."[[x,0],[y,0]]," d."[[x,y],[0,x]]],[" c."[[x,y],[0,y]],[[x,x],[1,x]]]

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The correct Answer is:
b.
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