Question

Let U = {1, 2, 3, 4, …, 25}, B = {3, 6, 9, …, 21}, C = {3, 6, 9, …, 21}, and D = {6, 12, 18, 24}. Find the following.
21. B ∪ C
22. C ∪ D
23. U ∪ D
24. B ∪ C ∪ D
25. U ∪ B ∪ C
26. B ∩ C
27. B ∩ D
28. C ∩ B
29. U ∩ D
30. U ∩ B ∩ C

Answer 1

Answer:

natural number and whole number