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AIME 2026b Problem 13

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Call finite sets of integers SS and TT cousins if For example, {1,2,5}\{1,2,5\} and {0,3,4}\{0,3,4\} are cousins. Suppose that the set SS has exactly 40404040 cousins. Find the least number of elements the set SS can have.

Dataset text AIME 1983 to 2026. Quoted with source.

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