olymmath

HMMT November 2009 E4

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  • Answer

How many subsets AA of {1,2,3,4,5,6,7,8,9,10}\{1,2,3,4,5,6,7,8,9,10\} have the property that no two elements of AA sum to 11 ?

Dataset text NuminaMath olympiads. Quoted with source.

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