A line goes endlessly in both the directions.
A line segment is a part of a line that has 2 endpoints.
A ray is a part of a line that begins at a particular point and extends endlessly in one direction.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.