A six-sided number cube is labeled with the numbers 1-6, one number on each face. Each number is used exactly once. How many possible outcomes exist when the cube is rolled two times?

Possible outcomes:

1. 1 to 1

2. 1 to 2

3. 1 to 3

4. 1 to 4

5. 1 to 5

6. 1 to 6

7. 2 to 2

8. 2 to 3

9. 2 to 4

10. 2 to 5

11. 2 to 6

12. 3 to 3

13. 3 to 4

14. 3 to 5

15. 3 to 6

16. 4 to 4

17. 4 to 5

18. 4 to 6

19. 5 to 5

20. 5 to 6

21. 6 to 6

The number of possible outcomes that exist when the cube is rolled two times is 21.