Question 1091548
The first three numbers are the same for all, so it doesn't matter.
the last four numbers have 10 choices for the first number, 10 for the second, 10 for the third, and 10 for the fourth.  That product is 10000.
Alternatively, between 0000 and 9999 including both are 10,000.  The first explanation is a better way to look at problem of this sort.  The second is a good way to check it.