If the number of elements in set A is 20, in set B is 30, and the number of elements in the union of sets A and B is 40, what is the number of elements in the intersection of sets A & B:
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Answer:
If the number of elements in set A is 20, in set B is 30, and the number of elements in the union of sets A and B is 40, what is the number of elements in the intersection of sets A & B: 10.
