Knights and Knaves: Carol, Niaj, Peggy, Dave, and Rupert

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 Carol, Niaj, Peggy, Dave, and Rupert. Carol says: "Peggy is a knave." Niaj says: "Carol is a knave." Peggy says: "Dave is a knave and Rupert is a knight." Rupert says: "Carol is a knight and Dave 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 5 inhabitants are knaves? Answer with the number.

Hints

Solution

Comments