CAT · Data Interpretation & Logical Reasoning
Truth-teller, liar and alternator problems.
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Q1 · Binary Logic / Truth-Tellers · HARD
In a group of four people—P, Q, R, and S—each person is either a truth-teller (always tells the truth) or a liar (always lies). P says, 'Q is a liar.' Q says, 'R and S are both liars.' R says, 'P is a truth-teller.' S says, 'Q is a truth-teller.' How many of them are truth-tellers?
Q2 · Binary Logic / Truth-Tellers · HARD
Four friends - P, Q, R, and S - made the following statements: P: 'Exactly one of us is lying.' Q: 'Exactly two of us are lying.' R: 'Exactly three of us are lying.' S: 'All of us are lying.' Who is/are telling the truth?