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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