Zero
555
Specify whether you are including the numbers between 0000 and 1000.
10999
91.
There are 900 three-digit whole numbers between 1 and 1000
In every 100 there are 10 numbers that have a units digit of 2 and 10 with 7, making 2 with 2 or 7. Between 0 and 1000 there are 10 hundreds, making 10 × 20 = 200 such numbers. BUT 2 and 7 are less than 10, so there are two less such numbers, making 200 - 2 = 198 such numbers.
By including the number 1000, the digit 1.
Zero
555
1 to 1000. Pilandromic 108
1-301 times
Specify whether you are including the numbers between 0000 and 1000.
10999
There are 3168 such numbers.
All the numbers between 999 and 3000 are four-digit numbers. You need to subtract 3000 - 999 - 1. The extra -1 is to account for the fact that the numbers 999 and 3000, in this case, are not included.
91.