Knights and Knaves: Mallory, Dave, and Peggy
Verified— unique solution
knights knaves
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Mallory, Dave, and Peggy.
Mallory says: "Dave is a knight."
Dave says: "If I am a knave, then Peggy is a knight."
Peggy says: "Mallory is a knave or Dave is a knight."
Who is a knight and who is a knave?
Hints
Hint 1
Hint 2
Hint 3
Solution
Commit an attempt to unseal the proof. Write your answer — right or wrong, thinking it through is the point.
Once you've worked out who is who: how many of the 3 inhabitants are knaves? Answer with the number.
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