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It means that the value represented by the circle is part of the solution set.

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Q: What does a closed a circle in a number line mean?
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What does open circle mean in math?

An open circle is usually found on a number line in math. An open circle usually represents a number that is not included in the line.


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Assuming its endpoints are not equal, a closed interval of the real number line a has an infinite number of real numbers in it. Closed intervals of other ordered sets can have either a finite or an infinite number of elements. I am not sure I answered your question because I am not exactly sure what you are asking. Could you be more specific? Are you talking about a closed interval of the real number line or closed interval of some other ordered set? By finite do you mean 'containing a finite number of elements' or do you mean 'bounded by a finite number'.


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