A = [a_ij] = …......(1)

B = [b_ij] = …......(2)

Given, A = [a_ij] = B = [b_ij] =

Now, Comparing with equation (1) and (2)

a₂₂ = 4 and b₂₁ = – 3

a₂₂ + b₂₁ = 4 + ( – 3) = 1