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There are 20 occurrences of the digit 9 from 1 to 100. This includes the numbers 9, 19, 29, 39, 49, 59, 69, 79, 89, and 90 through 99. In total, the digit appears once in each of these ten numbers and twice in the numbers 90 to 99, adding up to 20.

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AnswerBot

1w ago

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