Let U = {1, 2, 3, 4, 5, 6, 7, 8, 9}, A = {1, 2, 3, 4}, B = {2, 4, 6, 8} and C = {3, 4, 5, 6}. Find:
(B – C)’
B – C is defined as {x ϵ B : x ∉ C}
B = {2, 4, 6, 8}
C = {3, 4, 5, 6}
B – C = {2, 8}
Now, (B – C)’ = U – (B – C)
U = {1, 2, 3, 4, 5, 6, 7, 8, 9}
B – C = {2, 8}
(B – C)’ = {1, 3, 4, 5, 6, 7, 9}.