Úloha ID 1587 - 
Tři děti jdou na zmrzlinu a mohou si vybrat z příchutí podle následující tabulky:
| Zmrzlina | Jahoda | Čokoláda | Vanilka |
| Ledová tříšť | Malina | Jablko | Borůvka |
| Limonáda | Citron | Malina | Kofola |
Víme, že:
Které z následujících tvrzení je určitě pravdivé?
Správná odpověď je: B
Pokud si Boris dá borůvkovou ledovou tříšť, tak si Cyril musí vybírat z prvního nebo třetího sloupce. (Určitě víme, že si Antonín dal jahodovou zmrzlinu.) Protože ve třetím sloupci je Kofola a všichni chlapci si dali ovocnou příchuť, tak si musí dát citronovou limonádu, aby výběr proběhl právě ze dvou sloupců.
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