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  4. If A is a square matrix of order n × n , then adj (adj A) is equal to

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Q. If $ A $ is a square matrix of order $ n \times n $ , then $ adj (adj A) $ is equal to

AMUAMU 2014Determinants

Solution:

By the property of adjoint of a matrix
$adj \left(adj \,A\right)=\left|A\right|^{n-2}\,A$