Úloha ID 1611 - 
V truhlici může být sto zlaťáků, jedovatý had, nebo stará bota. Čarodějnice nám dala tři nápovědy. Víme ale, že právě jedna z nich je nepravdivá. Nápovědy jsou následující:
Které z následujících tvrzení je určitě pravdivé?
Správná odpověď je: A
Postupně budeme uvažovat negaci jednoho tvrzení a platnost zbylých dvou a zvážíme, zda taková kombinace může nastat. Kdyby byla nepravdivá první nápověda, byla by v truhlici stará bota, což neodporuje nápovědám dva a tři. Kdyby byla nepravdivá druhá nápověda, tak v truhlici musí být zlaťáky (hada vylučuje třetí nápověda). Třetí tvrzení pak musí být pravdivé, protože dle druhého tvrzení (které musí platit) nemůže být v truhlici jedovatý had.
| Výroky | Negace | |
| 1. | Z ∨ H | B |
| 2. | B | Z ∨ H |
| 3. | Z ∨ B | H |
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