Given that a matrix 1 2 3A = 2 3 4 1 1 5and B=A-, find the entry in row 2 and column 3 of

Given that a matrix 1 2 3A = 2 3 4 1 1 5and B=A-¹, find the entry in row 2 and column 3 of B.-1/21/41/2-1/41