Question

Choose the correct alternative:

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(λA) = λⁿ adj (A).
(iv) A(adj A) = (adj A)A = |A|I

Options

• Only (i)

• (ii) and (iii)

• (iii) and (iv)

• (i), (ii) and (iv)

Answer 1

(i), (ii) and (iv)