Kai cuts out all the page numbers of a book. He takes each number that has more than one digit and cuts the numbers into separate digits. Given that the book has 999 pages numbered 1 through 999, if he chooses one of these digits at random, what is the probability it is a 7?

Question

cwrw238 · Answer

if you consider the first 99 numbers if 10 - 99 sre split up that'll be 189 digits 
and 19 of those will be 7
thats about 10 5 probability of choosing 7 would be about 0.1
- can we extend that to 999?