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How many times does the digit 9 appear in the list of all integers from 1 to \(600\)?

 Jan 31, 2022
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From 1 to 100 ==20 "9s"

From 100 to 600==100 "9s"

 

20 + 100 ==120 "9s", which includes counting repeats such as 99, 199, 299, 399, 499, 599.

 Jan 31, 2022

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