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Omni-MATH / Let f(n) be the number of distinct digits of n when written in base 10. Compute the sum of f(n) as n ranges over all positive 2019-digit integers. · Discussion

Discussing Let f(n) be the number of distinct digits of n when written in base 10. Compute the sum of f(n) as n ranges over all positive 2019-digit integers. · Omni-MATH

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