A computer scans the digits of the counting numbers. For example, if it scans 1 2 3 4 5 6 7 8 9 10 11 12 then it sacned 15 digits. The computer begins its task and scans the first 1788 digits. The last number scanned is?
1 Answer
May 7, 2018
632
Explanation:
1 digit for the first 9 numbers,
2 digits por the next 90 numbers,
3 digits for the next 900 numbers... and so on...
So: digits for 9: 9
digits for 99: 9 + 90 * 2 = 189
digits for 999: 189 + 900 * 3 = 2889
As it is bigger than our number of digits 1788:
So;