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2022 MMATHS Team Online p4 - even 3 digit numbrt in base b >=10

Source:

October 1, 2023
number theoryMMATHS

Problem Statement

How many ways are there to choose three digits A,B,CA,B,C with 1A91 \le A \le 9 and 0B,C90 \le B,C \le 9 such that ABCb\overline{ABC}_b is even for all choices of base bb with b10b \ge 10?