Determine whether each statement is true or false. {1, 2, 4} ∪ {1, 2, 4} = {1, 2, 4}

Key Concepts

Set Union

Set union is an operation that combines all unique elements from two or more sets. The union of sets A and B, denoted as A ∪ B, includes every element that is in A, in B, or in both. For example, if A = {1, 2} and B = {2, 3}, then A ∪ B = {1, 2, 3}. Understanding this concept is crucial for determining the truth of statements involving set operations.

Set Equality

Set equality occurs when two sets contain exactly the same elements, regardless of the order or repetition of those elements. For instance, the sets {1, 2, 4} and {4, 2, 1} are equal because they contain the same elements. This concept is essential for evaluating whether the result of a union operation matches a given set.

Element Membership

Element membership refers to whether a specific element is contained within a set. This is denoted by the symbol '∈', meaning 'is an element of'. For example, if we say 1 ∈ {1, 2, 4}, it indicates that 1 is indeed a member of the set. Understanding element membership helps in verifying the contents of sets when performing operations like union.