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  4. If A is an invertible matrix of order n, then the determinant of textadj A is equal to :

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Q. If $A$ is an invertible matrix of order $n$, then the determinant of $\text{adj} \,A$ is equal to :

EAMCETEAMCET 2006

Solution:

Since $A$ is invertible matrix of order $n$, then the determinant of adj $A=|A|^{n-1}$