The system of linear equations x+y+z=2,2...

The system of linear equations `x+y+z=2,2x+y-z=3, 3x+2y+kz=4` has a unique solution if (A) `k!=0` (B) `-1ltklt1` (C) `-2ltklt2` (D) `k=0`

an empty set

equal to R

equal to {0}

equal to R-{0}

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