Find the inverse of 2-11-11-11-12

Find the inverse of $[\begin{matrix} 2 & - 1 & 1 \\ - 1 & 1 & - 1 \\ 1 & - 1 & 2 \end{matrix}]$

Matching exercise

Match the items on the right to the items on the left.

Step 1

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Step 6