Just For Fun - Who Is Telling The Truth

[kuiperbelt]

There are three people (Alex, Ben and Cody), one of whom is a knight, one a knave, and one a spy. The knight always tells the truth, the knave always lies, and the spy can either lie or tell the truth. Alex says: "Cody is a knave.” Ben says: "Alex is a knight.” Cody says: "I am the spy.” Who is the knight, who the knave, and who the spy?

[wolf63]

Alex - Knight
Ben - Spy
Cody - Knave

??

[DTCwordfan]

Jack - Cody's OH.....

[dustypuss]

I'm spartcus
.

[ZebuSanctuary]

Ben cannot be a knight as this would mean there were 2 knights.
Thus Ben is either a knave or a spy.

Cody too cannot be a knight since knights only tell the truth and the spy tells both lies and the truth.

Therefore it can be deduced Alex is a knight.

Since Alex states cody is a knave, this must be the truth. It follows Ben must be a spy.

Summing up;

Alex - Knight
Cody - Knave
Ben - Spy

[kuiperbelt]

>18.44 Thanks for the explanation. Your answers tally with the solution!!