BECE Mathematics 2019 Paper

Concept:The union of two sets is the set of all elements that belong to at least one of the two sets.Explanation:Given $A=\{2,4,6,8,10\}$ and $B=\{4,8,12\}$.To find $A \cup B$, list every element that appears in either set.The elements of $A$ are $2,4,6,8,10$.Now include the elements of $B$ that are not already in this list.Since $4$ and $8$ are already present, only $12$ needs to be added.Therefore, the combined set is $\{2,4,6,8,10,12\}$.This is option D.Answer:$A \cup B = \{2,4,6,8,10,12\}$Option D.