|A| = – 0 + 0

= ()

= – 1

Hence, A ^{– 1} exists

Cofactors of A are:

C₁₁ = – 1 C₂₁ = 0 C₃₁ = 0

C₁₂ = 0 C₂₂ = C₃₂ =

C₁₃ = 0 C₂₃ = C₃₃ =

adj A =

=

So, adj A =

Now, A ^{– 1} = .adj A

So, A ^{– 1} = .

Hence, A ^{– 1} =