Question 828761
<pre>
{{{(matrix(10,1,The, number, of, 4-digit, numbers, containing, at, most, 2, zeroes))}}}{{{""=""}}}{{{(matrix(5,1,The, number, of, 4-digit, numbers))}}}{{{""-""}}}{{{(matrix(8,1,The, number, of, 4-digit, numbers, with, 3, zeroes))}}}

There are 9999 integers up through 9999, but the first 999 have
less that four digits, so the number of 4 digit numbers is
9999-999 = 9000. Only 9 4-digit integers have more than 2 zeros,
these: 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000.

Answer: 9000-9 = 8991

Edwin</pre>