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Answer to Question #478 in Combinatorics | Number Theory for silvia rosso

Question #478
What is the sense of the equations: ABC = A; A ∪ B ∪ C = A?
Expert's answer

a) ABC = A: A is a subset of BC (A ∈ BC);
b) A ∪ B ∪ C = A: B ∪ C is a subset of A (A ∋ B ∪ C).

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