Including the one in ' 1 ' and the one in '100', there are 21 1s.
Every other digit 2 - 9 appears 20 times between 1 and 100 .
120 times.
With a total of 90,000 five digit numbers, we can conclude that there is 45,000 EVEN five digit numbers.
12 numbers
There are only 999 three digit whole numbers.
2240
11 times
As a digit in other numbers it appears 20 times
Infinitely many.
18
18 times
A total of 44 times.
20000 times
200
200
16
700000
If 11 and 111 is counted as 1 digit, the answer is 119.If 11 is counted as 2 digit 1's, the answer is 131.