A = {12,13,14,15,16}
B = {11, 15,17,18}
C = {18, 19, 20, 21, 12}
with venn diagram please
(A U B) ∩ C = {18}
(A ∩ B) ∩ C = {}
(A ∩ C) ∩ B = {}
(A U C) - B
(A - C) ∩ B`
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