A) \[-1<k<1\]
B) \[-2<k<2\]
C) \[k\ne 0\]
D) \[k=0\]
Correct Answer: C
Solution :
For unique solution, \[\Delta \ne 0\] So, \[\left| \begin{matrix} 1 & 1 & 1 \\ 2 & 1 & -1 \\ 3 & 2 & k \\ \end{matrix} \right|\ne 0\Rightarrow -k\ne 0\]
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