please answer my questions in math
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Answer:
union of sets are the sets containing numbers that belong to one or both of two sets
intersection of sets are numbers that can be found in both two sets
a.1+3=2
-means that if you add the set of 1 and 3 you get the set of 2
b.2-3=1
-means if you subtract the set of 2 and 3 you get the set of 1
c.2-1=3
-means that if you subtract the set 2 to set 1 you get the set 3