Probability is the likelihood or chance of something happening.
For example: Suppose we select a marble without looking.
Let's find how likely it is that we will pick a red one.
First count the total number of marbles.
There are 7 marbles.
Out of 7 marbles, 5 are green and 2 are red.
Since, there are more of green marbles than red marbles, so, it is less likely that you will pick a red marble.
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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.