The number of objects is even if they can be matched in pairs.
The number of objects is odd if they cannot be matched in pairs.
For example: Let's identify if the number of triangles given below is even or odd.
Make pairs of the given triangles.
Here, we notice that the given triangles make 5 complete pairs.
So, the number of given triangles is even.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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.