139
90. all the numbers from 10 through 99
300
There are 6484 digits BETWEEN the two given numbers.
223
25 digits
192 digits
There are 2700 digits.
17
101
139
19 do.
90. all the numbers from 10 through 99
Twenty of them from 9 to 99
1 googol = 10100 = '1' followed by 100 zeroes. The number has (1 googol + 1) digits.
300
There are 6484 digits BETWEEN the two given numbers.