Răspuns:
Explicație pas cu pas:
A ={1;2}, B ={2;3;4}
AxA= {(1, 1), (1,2), (2,1), (2,2)}
AxB= {(1, 2), (1, 3), (1, 4), (2, 2), (2, 3), (2, 4)}
BxA= {(2,1), (2, 2), (3, 1), (3, 2), (4, 1), (4,2)}
BxB = {(2,2), (2,3),(2,4), (3,2), (3, 3), (3, 4), (4,2), (4, 3), (4,4)}