Abstract
Cameron introduced a natural probability measure on the set {crop of sum-free sets, and asked which sets of sum-free sets have a positive probability of occurring in this probability measure. He showed that the set of subsets of the odd numbers has a positive probability, and that the set of subsets of any sum-free set corresponding to a complete modular sum-free set also has a positive probability of occurring. In this paper we consider, for every sum-free set S, the representation function r s ( n), and show that if r s ( n) grows sufficiently quickly then the set of subsets of S has positive probability, and conversely, that if r s ( n) has a sub-sequence with suitably slow growth, then the set of subsets of S has probability zero. The results include those of Cameron mentioned above as particular cases.
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