HMMT November 2024 U11
- Guts
- Answer
A four-digit integer in base 10 is friendly if its digits are four consecutive digits in any order. A four-digit integer is shy if there exist two adjacent digits in its representation that differ by 1. Compute the number of four-digit integers that are both friendly and shy.
Dataset text NuminaMath olympiads. Quoted with source.
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148
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