Mathematical Analysis conceptional, You need to answerthe question clearly, such as say Yes, and the explain. Follow thecomment
Set conceptional question
1. Are all open sets are open?For  example(2,3), (5,9)
2. Are all closed sets are closed?
3. Can a closed set have finite subcover?
4. Does closed and open set have opencover?
5. What is closure? Does closure mean the set isclosed?
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