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AMC (AIMO validation set) / How many nonempty subsets B of 0,1,2,3,⋯,12 have the property that the number of elements in B is equal to the least element of B? For example, B=4,6,8,11 satisfies the condition. · Discussion
Discussing How many nonempty subsets B of 0,1,2,3,⋯,12 have the property that the number of elements in B is equal to the least element of B? For example, B=4,6,8,11 satisfies the condition. · AMC (AIMO validation set)
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