Let A=((1,0,0),(2,1,0),(3,2,1)). If u(1)...

Let `A=((1,0,0),(2,1,0),(3,2,1))`. If `u_(1)` and `u_(2)` are column matrices such that `Au_(1)=((1),(0),(0))` and `Au_(2)=((0),(1),(0))`, then `u_(1)+u_(2)` is equal to :

`[[-1], [1], [0]]`

`[[1], [-1], [-1]]`

`[[-1], [-1], [0]]`

`[[-1], [1], [-1]]`

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