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How many times does the digit 9 appear in the list of all integers from 1 to 500? (The number $ 99 $, for example, is counted twice, because $9$ appears two times in it.)

 Mar 25, 2020
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The digit 9 appears 100 times, between 1 and 500, if you count the repeats such as 99.

 Mar 25, 2020

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