If the matrix \( A=\left[\begin{array}{lll}1 & a & 2 \\ 1 & 2 & 5 \...

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If the matrix \( A=\left[\begin{array}{lll}1 & a & 2 \\ 1 & 2 & 5 \\ 2 & 1 & 1\end{array}\right] \) is not invertible, then \( a= \)
\( \mathrm{P} \)
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