Adjectives in the first position - before the noun - are called attributive adjectives.
He is a fantastic football player.
Those in the second position - after the noun - are called predicative adjectives. Notice that predicative adjectives do not occur immediately after the noun. Instead, they follow a verb.
The room looked dark and gloomy.
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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.