👉 In algebra, a union is an operation that combines two or more sets of numbers. It means that all elements in one set are also present in another set. For example: - Union of {2, 4} and {3, 5} = {2, 3, 4, 5} - Intersection of {1, 2, 3} and {4, 5} = {4, 5} - Difference of {1, 2,