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2) Union of sets :
A ? B means the element that belong to at least one of the two
sets A or B
AB A AB
B
1 2? 4 ?1 ?3
? 3? ? ?1 ?2 ?5 ?4
?2 ?3
?4
A ? B = {1, 2, 3, 4} A ? B = {1, 2, 3, 4} A ? B = {1, 2, 3,4,5}
B ?A ?A ?B = A
Example
Represent X, Y by venn diagram then find:
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