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no of digits wanted

Source: VI May Olympiad (Olimpiada de Mayo) 2000 L1 P3

September 22, 2022
Digitsnumber theory

Problem Statement

To write all consecutive natural numbers from 1ab1ab to ab2ab2 inclusive, 1ab11ab1 digits have been used. Determine how many more digits are needed to write the natural numbers up to aabaab inclusive. Give all chances. (aa and bb represent digits)