Abstract nouns are nouns that are all about feelings or characteristics and NOT any of your senses.
fear, love, trust
Abstract nouns can be formed from adjectives, verbs, and nouns.
brave → bravery [adverb from adjective]
free → freedom [adverb from verb]
slave → slavery [adverb from noun]
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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.