## Thinking Mathematically (6th Edition)

A∩∅ U = {1,2,3,4,5,6,7} A = {1,3,5,7} The set A∩ ∅ represents the elements which are common in both A and $\lt$ ∅ (∅ represent empty set). Therefore the common elements of A and ∅ is an empty set. Therefore A∩ ∅ = {} = ∅