2893 digits in all, made up as follows:
9 1-digit numbers (1 to 9) = 1*9 = 9 digits
90 2-digit numbers (10 to 99) = 2*90 = 180 digits
900 3-digit numbers (100 to 999) = 3*900 = 270 digit
1 4-digit number (1000) = 4*1 = 4 digits
There are 2892 digits.
There are 2700 digits.
1
1
630 digits.
1 digit
1
1 in 1 and 3 in 200.
If you include the combination which comprises no numbers (the empty set), then there are 16: 1 with no digits 4 with 1 digit 6 with 2 digits 4 with 3 digits, and 1 with 4 digits.
There are 6484 digits BETWEEN the two given numbers.
9
1390