Questão 2093767

A – B = {4,5,7,9} – {7,9,11,12,13} ∴ A - B = {4,5}.

B – A = {7,9,11,12,13} - {4,5,7,9} ∴ B – A = {11,12,13}.

A ∩ C = {4,5,7,9} ∩ {7,10} = {7}.

C ∪ A = {7,10} ∪ {4,5,7,9} = {4,5,9,10}.