How many times does the digit 1 occur in ten place in the numbers from 1 to 1000?
There are 280.
1000
There can be 103 = 1000 codes.
1000... 0600-0699 1600-1699 and so on.
There are 900 three-digit whole numbers between 1 and 1000
How many times does the digit 1 occur in ten place in the numbers from 1 to 1000?
There are 280.
1000
There can be 103 = 1000 codes.
1 to 1000. Pilandromic 108
-4
1000... 0600-0699 1600-1699 and so on.
There are 200 positive four digit integers that have 1 as their first digit and 2 or 5 as their last digit. There are 9000 positive four digit numbers, 1000 through 9999. 1000 of them have 1 as the first digit, 1000 through 1999. 200 of them have 2 or 5 as their last digit, 1002, 1005, 1012, 1015, ... 1992, and 1995.
300
10 1000/100 = 10
555