Mode

The number that appears most frequently among a set of numbers is called mode of the given set of numbers.

For example: Mode of the set of numbers {6, 3, 5, 6, 3, 3, 3} is 3 as 3 occurs the maximum number of times (4 times).
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Help

The correct answer is

Remember :

The smallest number is the one that comes first while counting.

Solution :

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.