C1.2.1 Understand and use set language, notation and Venn diagrams to describe
Understand and use set language, notation and Venn diagrams to describe sets. Venn diagrams are limited to two sets. The following set notation will be used: • n(A) Number of elements in set A • A′ Complement of set A • Universal set • A ∪ B Union of A and B • A ∩ B Intersection of A and B. Example definition of sets: A = {x: x is a natural number} B = {a, b, c, … } C = {x: a ⩽ x ⩽ b}.