Define a unit matrix.

Define a column matrix.

Define unit

Define a row matrix.

Give an example of a matrix which is a scalar matrix which is not a unit matrix.

Give an example of a unit 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

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

If A is a unit matrix of order n, then A(adjA) is