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Which of the following is/are incorrect?...

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

A

(i)

B

(ii)

C

(iii) and (iv)

D

none of these

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The correct Answer is:
D
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