Given sets are A = {1, 2, 3, 4} and B = {1,2,3, 5,6}

A ∩ B = {1,2, 3,4} ∩ {1,2, 3, 5, 6}

= {,,} …… (1)

B ∩ A = {1, 2, 3, 5, 6} ∩ {1, 2, 3, 4}

= {,,} …….(2)

From (1) and (2)

A ∩ B and B ∩ A are .