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     EduGorilla 
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    Which of the following statements 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 = |A|             
    (iv) Adjoint of a diagonal matrix is a diagonal matrix. 

    Options :-

    1. (i)
    2. (ii)
    3. (iii) and (iv)
    4. None of these
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