Ononot — What is the rank of the identity matrix I3 = \begin{pmatrix}

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Linear Systemseasy

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What is the rank of the identity matrix $I_3 = \begin{pmatrix} 1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1 \end{pmatrix}$ ?