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[" 11."quad " Af "(1)A=[[1,2,3],[2,0,-2]...

[" 11."quad " Af "(1)A=[[1,2,3],[2,0,-2]],B=[[1,1,-1],[2,0,3],[3,-1,2]][[721,(" and ")],[3,-1,2]]],[[" (then find "A(BC)" .Hence or otherwise,write down (AB) "C" ) "]]

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