pairwise disjoint sets
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Find the number of elements in A1 UNION A2 UNION A3 if there are 100 elements in A1, 1000 in A2, and 10000 in A3 if
a) A1 is subset of A2 and A2 is subset of A3.
b) The sets are pairwise disjoint.
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This solution contextualizes pairwise disjoint sets.
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a) Since A1 is a subset of A2, every element of A1 is in A2. Since A2 is a subset of A3, all the elements in A2, ...
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