How to find the conjugate of a matrix

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To find the adjoint of a matrix first we have to find the conjugate of matrix. for a 3X3matrix \begin{bmatrix} 1&-1& 1 \\ 1&2 & 2\\1&1&2 \end{bmatrix} some one explain me how to find the conjugate of this matrix and the adjoint of this matrix. please