| __ | 1. | #, the cardinal number | | A. | The empty set | | __ | 2. | Element | | B. | Number of elements in the set | | __ | 3. | Intersection | | C. | Where sets overlap; elements in more than one set | | __ | 4. | Null Set | | D. | A part of a set | | __ | 5. | Subset | | E. | The things in a set |
| __ | 6. | Complement of a set | | A. | When you add sets together | | __ | 7. | Set | | B. | All that is not in the set | | __ | 8. | Union | | C. | Pictorial representation of sets | | __ | 9. | Universal Set | | D. | A collection of things | | __ | 10. | Venn Diagram | | E. | The set that contains everything |
| __ | 11. | U | | A. | is not an element of | | __ | 12. | \ | | B. | union | | __ | 13. | {1,2,3 } | | C. | is an element of | | __ | 14. | Ø | | D. | subset | | __ | 15. | ∈ | | E. | not a subset | | __ | 16. | ∉ | | F. | null set | | __ | 17. | ∩ | | G. | Set, a collection of elements | | __ | 18. | ∪ | | H. | intersection | | __ | 19. | ⊂ | | I. | Universal Set | | __ | 20. | ⊄ | | J. | less |
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