Determiners are used to modify a noun. This function is generally performed by articles, demonstratives, and quantifiers.
Quantifiers are words that answer two simple questions: How many things? or How much of something?
Quantifiers are always followed by the noun they modify.
I need some milk. [How much?]
My brother has got many friends. [How many?]
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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.
21,27,23
21 is the smallest number.