Question

Which of the given statements is correct with respect to the following scenario?
Knights only speak the truth. Knaves only speak lies. Spies are alternators, they speak both truths and lies in
alternate sentences either way. There are three people, Alan, Barry, and Cole, one of whom is a knight, one is a
knave and the other is a spy.
Alan says, "I am not a Knight" while, Barry says, "I am a spy" and Cole says, "Barry is not a Knight".​

Answer 1

Answer:

Alan is spy, Barry is knave and Cole is the knight

Explanation:

Alan and Barry can't be knight because if they were then they would be lying.

So Cole has to be the knight and this also confirms that Barry is not the knight.

Now there is a spy and a knave among Alan and Barry, which means either one of them is lying or both of them are.

Alan says he is not the knight which is true and thus revealing him to be the spy and Barry to be the knave.