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Mar
14
comment In how many of the integer numbers between 0 and 10,000 does the digit 3 appear to the left of 4
I used the same method, though labeled the bullets as x and y. This allowed me to use qualifying expression, e.g x != 4. So, 34xy (unqualified); followed by 3x4y where x != 4 (as those are already counted in 34xy); followed by 3xy4 where x != 4 and y != 4. Just a bit more structure to explain why some are 10x10 others 9x10 and some 9x9.
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