I am not entirely sure what pairwise disjoint means in the problem
Find the number of elements in A1∪A2∪A3 if there are **** elements in A1, **** elements in A2, and **** elements in A3 in each of the following situations:
(a) The sets are pairwise disjoint.
(b) There are ** elements common to each pair of sets and * elements in all three sets
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Pairwise disjoint means that that any pair of distinct sets have an intersection that is empty
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