👉 In mathematics, the union of two sets A and B is defined as the set that contains all elements that are in either A or B or both. This means that if you have a set A = {1, 2, 3}, then its union with itself would be {1, 2, 3, 4, 5}. The intersection of two sets A and B is defined as the set containing only elements that are common to both A and B. This means if
