Knights and Knaves: Dave, Olivia, Grace, and Judy
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 Dave, Olivia, Grace, and Judy.
Dave says: "If I am a knight, then Olivia is a knight."
Olivia says: "Grace is a knave."
Grace says: "I am a knight or Judy is a knave."
The others say nothing.
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 4 inhabitants are knaves? Answer with the number.
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