The comma tells us when to pause while reading and helps organize writing. Since commas can be used in a variety of ways, they have a few rules you must memorize.
The given sentence should use the following rule:
Use a comma to separate two adjectives of similar importance that are reversible in order.
The short, sweet lady is my grandmother.
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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.