Discrete Math Quiz
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In a database of 500 records, let AA be records containing keyword "algorithm", BB be records containing "optimization", and CC be records containing "machine learning". If ∣Ac∩Bc∩Cc∣=125|A^c \cap B^c \cap C^c| = 125 and the inclusion-exclusion calculation gives ∣A∪B∪C∣=375|A \cup B \cup C| = 375, which statement must be true?
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