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`        Is S = (1,2) an open set or not an open set? Why?      ..........`
5 months ago

Arun
23521 Points
```							open interval (1,2) is an open set. Any open interval is an open set. Both R and the empty set are open
```
5 months ago
Vikas TU
10073 Points
```							Dear student Additional information .On the number line, it means you have a solid ball or bubble instead of an open one. One way to determine if you have a closed set is to actually find the open set. The closed set then includes all the numbers that are not included in the open set. For example, for the open set x = 3.
```
5 months ago
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### Course Features

• 101 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions