Question

If A = {6, 7, 8, 9}, B = {4, 6, 8,10} and C = {x : x ∈ N : 2 < x ≤ 7};  Find: B - (A ∩ C).

Answer 1

A = {6, 7, 8, 9}

B = {4, 6, 8, 10}

C = {x : x ∈ N : 2 < x ≤ 7}

= {3, 4, 5, 6, 7}

A ∩ C  = {6, 7, 8, 9}  ∩ {3, 4, 5, 6, 7}

= {6, 7}

B - (A ∩ C) = {4, 6, 8, 10} - {6,7}

= {4, 8,10}