How many figures are required for numbering the pages of a book containing 1000 pages?

One Answer on this Question

1. pages # figures
   1000 1000 4
   from 999 to 100 (999-99)*3 2700
   from 99 to 10 (99-9)*2 180
   from 9 to 1 (9-0)*1 9
   total sum= 2893

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