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