U = {x/x ∈ +; x < 12}
A = {2x/x ∈ +; x < 5}
B = {3x/x ∈ +; x < 4}
C = {1; 5; 6; 9; 10; 11}
determine (A(elevado)c∩B(elevado)c) – C.
Pa hoy