BECE Mathematics 2020 Paper

Concept:The union of two sets includes every element that appears in either set, without repeating any common element.Solution:Given $P=\{7,11,13\}$ and $Q=\{9,11,13\}$.List all distinct elements from both sets: $7, 9, 11, 13$.The common elements $11$ and $13$ are written only once.Arranging them in ascending order gives $P \cup Q = \{7,9,11,13\}$.Answer:Option A ($\{7, 9, 11, 13\}$)