Addition is an operation that increases a number after the operation.
For example: Consider the number 56.
If a number, say 5, is added to it, then we get 61.
Here, 56 is increased to 61 after the addition 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.