# How many 5-digit numbers can be formed using (0-9)?

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Ananda Dasgupta
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Mar 19, 2018

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The trick is to realize that a number can not start with a zero!

Now, there are

So, the number of possible five digit numbers is

These are the numbers 10000 to 99999. We could, of course, just have counted them to get

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Mar 19, 2018

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100 000 combinations

#### Explanation:

You can have up to 10 combinations for each digit, times the number of... Numbers you want.

So you have

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