Subtraction is an operation that decreases a number after the operation.
For example: Consider the number 28.
If a number, say 6, is subtracted from it, then we get 22.
Here, 28 is decreased to 22 after the subtraction operation.
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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.