กำหนดให้
A = { 1, 4, a, b, d } - {1, b, c }
B = { 3, 3, c } ∪ {4, b, d }
C = { 1, 4, 3, b } ∩ {3, a, b }
B ∩ (C ∪ A) คือเซตในข้อใด
{ 1, 3, 4, b, d }
{ 3, 3, b, d }
{ 3, a, b, d }
{ 3, 4, a, b, d }
{ 3, 4, b, d }