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If A+B=[[1,0],[1,1]] and A-2B= [[-1,0],[...

If `A+B=[[1,0],[1,1]]` and `A-2B= [[-1,0],[0,-1]]` ,then `A = ` (1)` [[1,1],[2,1]]` (2)`[[2/3,1/3],[1/3,2/3]]` (3) `[[1/3,1/3],[2/3,1/3]]` (4) none of these

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