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If A^-1 =[(1,-1,0),(0,-2,1),(0,0,1)] the...

If `A^-1` =`[(1,-1,0),(0,-2,1),(0,0,1)]` then (A) A is non-singular (B) A is skew symmetric (C) `|A|=2` (D) `AdjA= [(1/2,- 1/2,0),(0,-1,1/2),(0,0,- 1/2)]`

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