Which of the following is/are correct?
(i) Adjoint of a
symmetric matrix is also a symmetric matrix.
(ii) Adjoint of a
diagonal matrix is also a diagonal matrix.
(iii) If A is a square
matrix of order n and λ is a scalar, then adj( λ A) = λn
adj( A) .
(iv) A(adjA) = (adjA)
A =| A | I