Who drank?

Logic Level 2
  • Person A: I didn't drink anything but person C did.
  • Person B: Person A or C is right.
  • Person C: I saw person A drink.
  • Person D: Person B drank something.

If only one person drank and only one person lied, then who told the truth and who lied?

Enter your answer using numbers. Example: if A,B,C are right, then the answer would be 1110. 1 for truths and 0 for lies.


The answer is 1101.

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Deepthi Unnikrishan by Deepthi Unnikrishan , 42, India

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3 solutions

Tran Hieu
Mar 9, 2016

The answer could also be 0111

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@Tran Hieu : Sir, please post your reports in the "view reports" button present in the bar-bar-bar menu in the upper right corner. This section is meant for solutions only.

Sravanth C. - 5 years, 3 months ago
Saya Suka
Feb 20, 2021

A & C are being contradictory, so one of them must be that sole liar while both B & D are telling the truth. As we're told that only one person drank, it's natural to believe a known, already identified trustworthy person D who said the drinker is B. C is totally flinging a false allegation on A (since B should be the sole drunk among the four of them) though I found it confusing with A's "... but person C did" statement. I guess that's why Tran said 0111 could also be the answer.

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Elijah Frank
Dec 4, 2020

C is only guided by the vision, not by another fact of the same one, for which A has had more reasons, so it has the truth, also D is 1 because B is as undecided from A OR C (1101).

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