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Between 1001 and 1100, the digit '1' appears in the following positions: in the thousands place for all numbers from 1001 to 1099, in the hundreds place for all numbers from 1000 to 1099, and in the tens and units places as well. Counting the occurrences, '1' appears 101 times in the thousands place, 100 times in the hundreds place, and 20 times in the tens and units places combined (10 in the tens place from 1010 to 1090 and 10 in the units place from 1001 to 1009). Therefore, the total count of '1's is 101 + 100 + 20 = 221.

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6h ago

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