Case 178
The Disabled Camera
A security camera was deliberately switched off.
Rule: exactly one suspect is guilty. The guilty suspect lies. Every innocent suspect tells the truth.
Peyton
“Harper and Kendall are both innocent.”
Quinn
“Blake is guilty.”
Harper
“Either Peyton or Blake is guilty.”
Blake
“Kendall is guilty.”
Kendall
“Harper is innocent.”
Who is guilty?
Solution: Blake
If Blake is guilty, Blake's statement is false and every other statement is true. Testing the other suspects creates at least one contradiction.