Answer
A ∪∅ = { 1,3,5,7}
Work Step by Step
A ∪∅
U = {1,2,3,4,5,6,7}
A = { 1,3,5,7}
The set A ∪∅ represents all elements of A and elements of ∅
(∅ represent empty set).
Therefore the elements of A ∪∅ are 'A' elements only i.e. 1,3,5,7
A ∪∅ = { 1,3,5,7}.
