Answer:
Given, Since, is a \[3\times 1\] matrix and matrix. Therefore, order of matrix A is \[1\times 3\] matrix. So, let \[A=[\begin{matrix} x & y & z \\ \end{matrix}]\] Now, we have \[\Rightarrow \] On equating the corresponding elements, we get \[x=-1,\] y = 2 and z = 1 Hence, \[A=[\begin{matrix} -\,1 & 2 & 1 \\ \end{matrix}]\]
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