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How many times does the digit 9 appear in the list of all integers from 1 to 5000? (The number 99, for example, is counted twice, because 9 appears two times in it.)

 Jul 1, 2022
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From 1 to 100 ==20 
From 101 to 1000 ==280
[20 + 280] * 5 ==1,500 - "9s" between 1 and 5,000.

 Jul 1, 2022

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