Mathematics, 12.08.2020 05:01, yoongnzl

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.)

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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 $...

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