1. The two methods of representing a set is Roster Notation and Set Builder Notation.
2. The four basic operations on a set are set union, set intersection, set complement, and set difference.
IMPORTANT NOTE:
In the first question, you didn't show questions 21-22, so I'm not sure what the real answer is, since there are 3 methods in representing a set. The answer might be two of these (roster notation, set builder notation, and word description/statement.) You should choose between two of these three methods on what you think is the correct answer.
Answers & Comments
Answer:
1. The two methods of representing a set is Roster Notation and Set Builder Notation.
2. The four basic operations on a set are set union, set intersection, set complement, and set difference.
IMPORTANT NOTE:
In the first question, you didn't show questions 21-22, so I'm not sure what the real answer is, since there are 3 methods in representing a set. The answer might be two of these (roster notation, set builder notation, and word description/statement.) You should choose between two of these three methods on what you think is the correct answer.