HMMT 2025 C1
- Combinatorics
- Answer
Compute the number of ways to arrange the numbers 1, 2, 3, 4, 5, 6, and 7 around a circle such that the product of every pair of adjacent numbers on the circle is at most 20. (Rotations and reflections count as different arrangements.)
Dataset text NuminaMath olympiads. Quoted with source.
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56
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