Colegii vor sa isi ia la revedere si sa se indrepte spre casa. Ovidiu nu este hotarat in ce directie sa ia mijloacele de transport in comun.

”Pune o intrebare ”, rade Petru, cu referire la una dintre problemele consacrate de logica.

C. Intrebare

La o rascruce de drumuri stau 2 oameni: unul in fata drumului care duce spre dreapta si unul in fata drumului care duce spre stanga. Unul dintre cei doi oameni este sincer (spune mereu adevarul), celalalt este mincinos (minte intotdeauna). Unul dintre drumuri duce spre orasul A (unde calatorul vrea sa ajunga), celalalt catre orasul B (unde calatorul nu doreste sa ajunga). Poate calatorul sa determine drumul catre orasul A punand o singura intrebare cu raspuns da sau nu?

Sursa: problema clasica

The friends say goodbye and plan to go home. Ovidiu is not convinced which direction to take.

"Ask a question," laughs Peter, referring to one of the logic puzzles.

C. Question

At a crossroad there are 2 people: one next to the road leading to the right and one next to the road leading to the left. One of the two people is a knight (always tells the truth), the other is a knave (always tells lies). One of the roads leads to the city A (where the traveler wants to go), the other to the city B (where the traveler does not want to go). Can the traveler decide which road to take to reach A by asking a single question with yes or no answer?

Source: classic puzzle