If the system of equations x-k y-z=0, k ...

If the system of equations `x-k y-z=0, k x-y-z=0,x+y-z=0` has a nonzero solution, then the possible value of `k` are a.`-1,2` b. `1,2` c. `0,1` d. `-1,1`

`-1,2`

`1,2`

`0,1`

`-1,1`

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