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A=[(1,2),(2,1)], then adjoint of A is eq...

`A=[(1,2),(2,1)],` then adjoint of A is equal to (A) `[(1,-2),(-2,1)]` (B) `[(2,1),(2,1)]` (C) `[(1,-2),(-2,1)]` (D) `[(-1,2),(2,-1)]`

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