Who is the knight, who the knave, and who the spy? {Use your Brain. Don't Google it. The solution is very interesting}

Question

There are three persons (Alex, Brook and Cody). One of whom is a knight, one is a knave and one is 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."
Brook says: "Alex is a knight."
Cody says: "I am the spy."

Who is the knight, who the knave, and who the spy?

Answer 1

Brook is not the knight (Because Knight always tells the truth and if he is a Knight, He will not say that Alex is a knight). Accordingly it proves Brook is not a knight.

It came up with logic now. Not Assumption.

In similar way Cody is not the knight, since his statement would then be a lie.

Hence it proves that out of three Alex is a Knight and Knight always tells the truth So Alex statement is 'Cody is a Knave'.

Therefore Alex is the knight hence Cody is the knave and Brook is the spy.

Answer 2

alex is knight brook is spy and cody is knave