A collective noun names a group of people or things. That group is considered one unit or one whole. Collective nouns are usually followed by the word “of” and a noun telling who or what belongs in that group.
A collection of coins
A fleet of ships
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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.