If the trivial solution is the only solution of the system of equat...

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If the trivial solution is the only solution of the system of equations
\[
\begin{array}{l}
x-k y+z=0 \\
k x+3 y-k z=0 \\
3 x+y-z=0
\end{array}
\]
\( \mathrm{P} \) then the set of all values of \( k \) is :
(1) \( R-\{2,-3\} \)
(2) \( R-\{2\} \)
(3) \( \mathrm{R}-\{-3\} \)
(4) \( \{2,-3\} \)
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