If the matrix A = 1a2125211 is not invertible, than a = ______________ – InterviewSolution

1.	If the matrix A = 1a2125211 is not invertible, than a = ___________________.
Answer» If the matrix A = $[\begin{matrix} 1 & a & 2 \\ 1 & 2 & 5 \\ 2 & 1 & 1 \end{matrix}]$ is not invertible, than a = ___________________.

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