Question

How many whole numbers are there with not more than 4 digits?

I thought the answer is 9999, but it apparently isn't....

Answer 1

Did you count zero?? If you didn't well there you go.

Answer 2

We need to find whole numbers not more than 4 digits

Not more than 4 digits means it can be a one digit, 2 digit, 3 digit and a 4 digit number

It is a whole number so we include 0

-----, ------- , -------, --------

First digit we can use numbers 0 to 9 so 10

For second digit we can use numbers 0 to 9 so 10

For third digit we can use numbers 0 to 9 so 10

For fourth digit we can use numbers 0 to 9 so 10

---10--, ---10---- , --10-----, ----10----

So 10* 10 * 10 * 10 = 10000

10000 whole numbers are there with not more than 4 digits