olymmath

AIME 2024b Problem 9

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There is a collection of 2525 indistinguishable white chips and 2525 indistinguishable black chips. Find the number of ways to place some of these chips in the 2525 unit cells of a 5×55\times5 grid such that:

Dataset text AIME 1983 to 2026. Quoted with source.

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902

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