Mathematics for IGCSE & O level - Sets (Section 3 - No. 3)
Consider the sets: A = {1, 2, 3, 4}, B = {3, 4, 5, 6}. Which of the following is/are TRUE?
A ∩ B = {3, 4}
A ∪ B = {1, 2, 3, 4, 5, 6}
5 ∈ A
2 ∉ B
Giải thích
A ∩ B = {3, 4}. A ∪ B = {1, 2, 3, 4, 5, 6}. 5 is not in A (5 ∉ A) and 2 is not in B (2 ∉ B).