HMMT November 2009 U22
- Guts
- Answer
Five cards labeled A, B, C, D, and E are placed consecutively in a row. How many ways can they be re-arranged so that no card is moved more than one position away from where it started? (Not moving the cards at all counts as a valid re-arrangement.)
Dataset text NuminaMath olympiads. Quoted with source.
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8
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