Mathematics for IGCSE & O level - Sets (Section 2 - No. 4)
If A = {1, 2, 3, 4, 5} and B = {4, 5, 6, 7, 8}, then what is A ∪ B (the union of A and B)?
{4, 5}
{1, 2, 3, 6, 7, 8}
{1, 2, 3, 4, 5, 6, 7, 8}
{}
解释
The union includes all elements from both sets, without duplication.