Which interval on a number line includes both of its end numbers?
AOpen interval
BHalf-open interval
CAn endless ray
DClosed interval
Answer & Solution
Correct answer: D. Closed interval
1. If the section includes both numbers it is a closed interval.
2. An open interval excludes both and a half-open one includes just one.
3. A ray goes on forever in one direction.
_Source: Wikipedia, Number line, Portions of the number line_
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