HMMT 2005 C4
- Combinatorics
- Answer
In how many ways can 4 purple balls and 4 green balls be placed into a grid such that every row and column contains one purple ball and one green ball? Only one ball may be placed in each box, and rotations and reflections of a single configuration are considered different.
Dataset text NuminaMath olympiads. Quoted with source.
Also HMMT 2005 E5.
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