Q6 of 74 Page 7

Find A (adj A) for the matrix A=.

A =


Cofactors of A are:


C11 = 9 C21 = 19 C31 = – 4


C12 = 4 C22 = 14 C32 = 1


C13 = 8 C23 = 3 C33 = 2


adj A =


=


So, adj A =


Now, A. adj A =


=


=


Hence, A. adj A = 25.I3


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