Unit 12 · Multi-Step Conditional Reasoning
Three Crime Suspects — One Truth-Teller
Lesson 10 of 30
About this lesson
Three suspects, one guilty. Each makes a statement. But only one is telling the truth. Whose statement is true? Whose is a lie? You need to test each scenario — only one arrangement produces exactly one truth-teller.
Chapters
Question
Three men – Arthur, Bobby and Darren – are suspects in a crime investigation. Only one man is guilty. When they are questioned, they give the following statements:
Darren: “Bobby is guilty.”
Bobby: “I am not guilty.”
Arthur: “I am not guilty.”
However, only one of the three men is telling the truth; the other two are lying.
Which one of the following statements must be true?
Take your Selective prep further
- Sample questions & worked solutions across core Selective topics
- Digital exam simulator with interactive practice sets
- Personalised progress tracking across all your devices
Already have an account? Log in here
No payment required. Compare Selective plans
Give Your Child the Best Chance at Selective Entry
Join NSW families preparing their children for the Selective Schools Placement Test with the most realistic online Selective practice tests available. First tests free—no credit card required.
Claim Your Free Selective Practice Tests