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9 digits used for pages 1 to 9 (9 pages * 1 digit)

180 digits used for pages 10 to 99 (90 pages * 2 digits)

453 digits used for pages 100 to 250 (151 pages * 3 digits)

Total = 9 + 180 + 453 = 642 digits used.

(Of course a trick answer is 10 as there are only 10 possible different digits in decimal).

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