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The following set of the three vectors

$$\begin{pmatrix} 1\\2\\1 \end{pmatrix}, \begin{pmatrix} x\\6\\x \end{pmatrix}\:and \:\begin{pmatrix} 3\\4 \\2 \end{pmatrix},$$

is linearly dependent when $x$ is equal to

  1. $0$
  2. $1$
  3. $2$
  4. $3$

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