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4. Logical puzzle. This puzale can be solved by translating statements into logical expressions and
reasoning from these expressions using truth tables: Four friends have been identified as suspects
for an unauthorized access into a computer system. They have made statements to the
investigating authorities. Alice said "Carlos did it". John said "I did not do it". Carlos said "Diana did
it". Diana said "Carlos lied when he said that I did it". 1) If the authorities also knew that exactly
one of the four suspects is telling the truth, who did it? Explain your reasoning. 2) If the authorities
also know that exactly one is lying, who did it? Explain your reasoning.

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  • 1. 4. Logical puzzle. This puzale can be solved by translating statements into logical expressions and reasoning from these expressions using truth tables: Four friends have been identified as suspects for an unauthorized access into a computer system. They have made statements to the investigating authorities. Alice said "Carlos did it". John said "I did not do it". Carlos said "Diana did it". Diana said "Carlos lied when he said that I did it". 1) If the authorities also knew that exactly one of the four suspects is telling the truth, who did it? Explain your reasoning. 2) If the authorities also know that exactly one is lying, who did it? Explain your reasoning.