Hello therpgmaker

Welcome to Math Help Forum!

Sorry, but I don't think this question makes sense, as you have stated it.There must be a minimum number of elements in A, otherwise it is clearly untrue thatfor any set A of positive integers taken from {1,2,...,12}For instance if A = {1}, the only subsets of A are and A itself.A must contain two disjoint subsets whose elements when added up give the same sum

Grandad