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[" 20.If "A=[[1,0,0],[0,2,1],[1,0,3]]" ,...

[" 20.If "A=[[1,0,0],[0,2,1],[1,0,3]]" ,then "(A-I)(A-2I)(A-3I)=],[[" a) "2I," b) "0," c) "I," d) "A]]

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