Answer :

Now, |A| = – 10


Hence, A – 1 exists.


Cofactors of A are


C11 =


C12 = – 1


C21 = – 1


C22 = 0


Since, adj A =


(adj A) =


=


Now, A – 1 = .adj A


A – 1 = .


A – 1 =


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