What is the cardinality of the union A∪B∪...∪Z? – math.stackexchange.com

What is the cardinality of the union A∪B∪...∪Z? – math.stackexchange.com

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I have figured out that $|A \cup B| = |A| + |B| - |A \cap B| $ and that $|A \cup B \cup C| = |A| + |B| + |C| - |A \cap B| - |A \cap C| - |B \cap C| + |A \cap B \cap C|$. I have not managed to ...

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