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A set is a well-defined collection of distinct objects, called elements. A set is well-defined if it is possible to determine clearly whether any given object belongs to it. Sets are usually labeled with capital letters. Elements are listed inside curly braces \(\{ \}\), separated by commas. An ellipsis \(...\) shows that a pattern continues. The symbol \(\in\) means "is an element of," while \(\notin\) means "is not an element of." The empty set, containing no elements, is written \(\{\}\) or \(\emptyset\).
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16Complete problems only, with worked solutions first. Show everything
| # | Title | Difficulty | |
|---|---|---|---|
| 128901 | Tree and Venn Diagrams · Exercise 7 | Medium | |
| 128903 | Tree and Venn Diagrams · Exercise 9 | Medium | |
| 128905 | Tree and Venn Diagrams · Exercise 11 | Medium | |
| 128906 | Tree and Venn Diagrams · Exercise 12 | Medium | |
| 130397 | Venn Diagrams · Exercise 2 | Medium | |
| 130399 | Venn Diagrams · Exercise 4 | Medium | |
| 130404 | Venn Diagrams · Exercise 9 | Medium | |
| 130406 | Venn Diagrams · Exercise 11 | Medium | |
| 130410 | Venn Diagrams · Exercise 15 | Medium | |
| 130411 | Venn Diagrams · Exercise 27 | Medium | |
| 130415 | Venn Diagrams · Exercise 31 | Medium | |
| 131146 | Tree and Venn Diagrams · Exercise 7 | Medium | |
| 131148 | Tree and Venn Diagrams · Exercise 9 | Medium | |
| 128897 | Tree and Venn Diagrams · Exercise 3 | Medium | |
| 130402 | Venn Diagrams · Exercise 7 | Medium | |
| 130413 | Venn Diagrams · Exercise 29 | Medium |