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What are the cardinalities of the unions, intersections, and Cartesian product?

What are the cardinalities of the unions, intersections, and Cartesian product? (Brisk · Chapter 1) — "30. What’s | A ∪ B ∪ T | ? 7. 31. What’s | A ∩ B ∩ T | ?…

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Calculer les cardinalités d’ensembles et d’un produit cartésien
|A ∪ B ∪ T| = 7
|A ∩ B ∩ T| = 0
|(A ∪ B ∪ T) × (B ∪ B ∪ B)| = 21
Le premier ensemble parenthésé contient 7 éléments.
Le second ensemble parenthésé est B lui-même et contient 3 éléments.
Chaque élément du premier ensemble est associé à un élément du second, ce qui produit 21 appariements.

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What are the cardinalities of the unions, intersections, and Cartesian product?

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"30. What’s | A ∪ B ∪ T | ? 7. 31. What’s | A ∩ B ∩ T | ? 0. 32. What’s | ( A ∪ B ∪ T ) × ( B ∪ B ∪ B ) | ? 21. (The first parenthesized expres- sion gives rise to a set with 7 ele- ments, and the second to a set with three elements ( B itself). Each el- ement from the first set gets paired with an element from the second, so there are 21 such pairings.)"

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