Explicație pas cu pas:
A U B = { 1,2,3,4,8,9,a,c,d,e}
A×B = {(1,2),(1,a),(1,c),(1,8),(1,4),(1,9),(1,e),(1,3),(3,2),(3a),(3,c),(3,8),(3,4),(3,9),(3,e),(3,3),(a,2),(a,a),(a,c),(a,8),(a,4),(a,9),(a,e),(a,3), (4,2),(4,a),(4,c),(4,8),(4,4),(4,9),(4,e),(4,3),(c,2),(c,a),(c,c),(c,8), (c, 4),(c,9),(c,e),(c,3), (d,2),(d, a),(d,c),(d,8),(d,4),(d,9),(d,e),(d,3), (8,2),(8,a),(8,c),(8,8),(8,4),(8,9),(8,e),(8,3), (2,2),(2,a),(2,c),(2,8),(2,4),(2,9),(2,e),(2,3)}
A-B = { 1,3,d}
