Mathematics for IGCSE & O level - Sets (Section 3 - No. 18)
If A = {1, 2, 3} and B = {3, 4, 5}, then A ∪ B is equal to:
{3}
{1, 2, 3, 4, 5}
{1, 2, 4, 5}
{}
Giải thích
A ∪ B represents the union of sets A and B, which includes all elements present in either set, without repetition.