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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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