A={x ∈ N 16 ≤ X < 20, x es multiplo de 3} B={x ∈ N 13 < x < 22 x es par} A = { 3 ; 5 ;7 ; 11 ; 13 } B = { 2x + 1/ x ∈ N; x ≤5 A = { x+ "x"es par , 1 < x < 10 } B = { 2; 3; 4; 5;7 ; 8} p = {x-3/x ∈ N ; 3 < x < 9} Q= {x+ 1/x ∈ N; 1≤ x<4 }