Question

x este divizivibil cu 4;5 ≤ x ≤ 20

Answer 1

5 ≤ x ≤ 20⇒x∈{5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20}dar x divizibil cu 4 ⇒x∈{8,12,16,20}