Question

If A = {5, 6, 7, 8, 9}, B = {x : 3 < x < 8 and x ∈ W} and C = {x : x ≤ 5 and x ∈ N}.
Find: A ∪ B and (A ∪ B) ∪ C

Answer 1

A = (5, 6, 7, 8, 9)

B = (4, 5. 6, 7)

C = (1, 2, 3, 4, 5)

A ∪ B = (4, 5, 6, 7, 8, 9)

(A ∪ B) ∪ C = (1, 2, 3, 4, 5, 6, 7, 8, 9)