Hint: First of all we can’t randomly pick any number and tell it is the greatest whole number because if you think that number is greatest then if 1 is added to it then the number you choose will not be greatest number.
Complete step-by-step answer: All non-negative integers are whole numbers. So, 0, 1, 2, 3, 4…… are the whole numbers.
We can clearly say that 1 is the smallest natural number and 0 is the smallest whole number.
But there is no largest whole number because each number has its successor. Thus, there is no largest whole number.
Note: Whenever you come to these types of problems you can easily find the smallest number but it is impossible to find the largest number because each number has its successor. So you can find only the smallest number but not the greatest number.