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The digit 2 occurs 20 times in the numbers from 1 to 100. It appears once in each of the numbers 2, 12, 20-29 (which contributes 10 occurrences), and once in 32, 42, 52, 62, 72, 82, and 92. In total, that's 1 (from 2) + 1 (from 12) + 10 (from 20 to 29) + 7 (from 32 to 92), equaling 20.

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Q: How many times does the digit 2 occur in numbers 1 to 100?
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