How many copies of the digit 0 are there among the digits of the first 1000 positive integers?
The digit 0 appears 223 times.
There are 9 zeros between 1 and 99 ==9
There are 20 zeros between 100 and 199==20 x 9 ==180
There are 3 zeros in 1000 ==3
Total ==9 + 180 + 3==192 zeros between 1 and 1000 inclusive.
