An even number is a number that ends with the digit 0, 2, 4, 6, or 8. For example: 18, 30.
An odd number is a number that ends with the digit 1, 3, 5, 7, or 9. For example: 21, 35.
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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.