Question

Sabendo que A = {1, 2, 3, 4}, B = {4, 5, 6, 7}, C = {1, 5, 7, 9, 11} e D = {0, 7, 12,} identifique (A U B) ∩ C e D ∩ C.

Answer 1

(AUB)∩C =
({1, 2, 3, 4} U {4, 5, 6, 7}) ∩ {1, 5, 7, 9} =
{1, 2, 3, 4, 5, 6, 7} ∩ {1, 5, 7, 9} =
{1, 5, 7}

D∩C = 
{0, 7, 12} ∩ {1, 5, 7, 9} =
{7}