We were able to determine the number of elements in the union of two sets with the formula
Can you determine a formula for finding the number of elements in the union of three sets? In other words, write a formula to determine n (A ⋃ B ⋃ C). [Hint: The formula will contain each of the following: n (A), n (B), n (C), and 2n (A ⋂ B ⋂ C).
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