To the nearest 10%, what percentage of all numbers contain a 9?

To the nearest 10%, what percentage of all numbers contain a 9?
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Answer :

You probably need to clarify that you mean “what percentage of the set of all integers contains the digit ‘9’? Because there are an infinite number of “numbers” that don’t contain that digit (and another infinite set that does). So that’s kind of a non-starter. However, the logic still holds. There is an infinite set of integers that contain the digit 9. There is also an infinite set of digits that does not. Maybe you need to restrict your range some more.
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