AIME 2005a Problem 5
- Paper
- Answer
Robert has 4 indistinguishable gold coins and 4 indistinguishable silver coins. Each coin has an engraving of one face on one side, but not on the other. He wants to stack the eight coins on a table into a single stack so that no two adjacent coins are face to face. Find the number of possible distinguishable arrangements of the 8 coins.
Dataset text AIME 1983 to 2026. Quoted with source.
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630
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