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All of the above. (Explanation) Apex said it was the answer so its the answer
Open interval does not include its end points while closed interval includes
An interval is the spacing of time. For example: I ran for an interval of 10 minutes then walked for an interval of 30 minutes. Or each car has an interval of 0.5 seconds.
There is no interval in a single number.
Yes, if it is the closed interval. No, if it is the open interval.