HMMT 2011 U24
- Guts
- Answer
In how many ways may thirteen beads be placed on a circular necklace if each bead is either blue or yellow and no two yellow beads may be placed in adjacent positions? (Beads of the same color are considered to be identical, and two arrangements are considered to be the same if and only if each can be obtained from the other by rotation).
Dataset text NuminaMath olympiads. Quoted with source.
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