Concept
What are the cardinalities of the unions, intersections, and Cartesian product?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"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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