Ononot — What is the nullity of the matrix \begin{pmatrix} 1 & 0 & 1

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Linear Systemshard

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What is the nullity of the matrix $\begin{pmatrix} 1 & 0 & 1 \\ 0 & 1 & 1 \\ 1 & 1 & 2 \end{pmatrix}$ ?