Question

A password contains eight digits, such as 17466780. How many different passwords can be formed?

Answer 1

There are 10 digits: from 0 to 9. We have 10 options in the first place of the password. In the second place, we have 10 options too and so on. Therefore, the number of possible passwords is

then, then answer is

`10^8=100,000,000`