Three suspect statements were made about a stolen item: Alice says 'I didn't take it.' Bob says 'Charlie took it.' Charlie says 'Bob is lying.' If exactly one statement is true, who stole the item?
Alice
Bob and Charlie's statements are direct contradictions, meaning exactly one of them must be true and the other false. Since only one statement overall is true, Alice's statement ('I didn't take it') must be false. Therefore, Alice stole the item.
About this riddle
Logic riddles give you a few facts and ask what must be true. List what you know, cross out what cannot be, and see what is left.
Difficulty: Medium. More like this: Logic riddles with answers or try Einstein's Logic Grid for a different kind of puzzle.
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