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JCECE Engineering JCECE Engineering Solved Paper-2009

  • question_answer
    If\[|A|\ne 0\]and \[A\] is of order n, then\[adj\,\,(adj\,\,A)\]is equal to

    A) \[|A{{|}^{n}}\]                                 

    B) \[|A{{|}^{2}}\]

    C) \[|A{{|}^{n-1}}I\]                           

    D) \[|A{{|}^{n-2}}\cdot A\]

    Correct Answer: D

    Solution :

    Using the result                 \[adj(adj\,\,A)=|A{{|}^{n-2}}\cdot A\]


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