KöMaL 2025 K881
Andris, Bori, Csaba, Dóri, Egon, Fanni and Gábor took part in a summer camp together. Andris knows everybody except Fanni, Bori knows three of the kids, Csaba knows one kid, and Dóri knows half as much of the kids as Egon. Fanni knows one less kid than Gábor. (Acquaintances are considered mutual.) Find the possible number of acquaintances of Fanni.
Official text KöMaL. Quoted with source.
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