An open ball in a real line R is?
- An open-closed interval
- A closed-open interval
- A closed interval
- An open interval
Explanation
- An open ball in the real line R is an open interval, denoted by (a, b) = {x | a < x < b}, where a and b are real numbers and a < b.
- This means that the endpoints a and b are not included in the interval.
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