Adjoint of a Matrix | example

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Adjoint OF a matrix || Inverse OF a matrix

Which of the following is/are incorrect? (i) adjoint of a symmetric matrix is symmetric (ii) adjoint of a unit matrix is a unit matrix (iii) A (adj A)=(adj A)A=absAI (iv) adjoint of a diagonal matrix is a diagonal matrix

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Adjoint OF square matrix

If A = {:[(2,-3),(4,1)]:} , then adjoint of matrix A is

Compute the adjoint of the matrix A given by A=[145326010] and verify that A(adjA)=|A|I=(adjA)A