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  = (5, 6, 7)

(A ∩ B) ∩ C = (5)