how many positive integers less than 1000 are there which contain one 4 or at least...
how many positive integers less than 1000 are there which contain one 4 or at least one 9 (or both)
Homework Answers
There are 
numbers
that contain neither 4 nor 9. (The −1 is because 000
doesn't count).
Subtract that from the total number of integers less than 1000
Of course, since 0 doesn't have a 4 or 9 anyway, you could equally well ask about non-negative integers less than 1000, in which case you'd just subtract 83 from 103, getting the same result.
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