Question

Dados os conjuntos A = {X ∈ Z/-3 ≤ x < 5} e B = {x ∈ Z/ 1 ≤ x < 8} determine (A ∩ B) ∩ B ̶ A:

a) ∅
b) {1}
c) {2}
d) {1,3}
e) {2,4}

Answer 1

A={-3,-2,-1,0,1,2,3,4}

B={1,2,3,4,5,6,7}

A inter B={1,2,3,4}

B-A={5,6,7}

(A inter B) inter B-A= ø

alternativa A