Suppose you ask a native,"Are you a knight,a liar,or a knave?"
The native answers,and you are able to figure out what he is.
What is the native?
1:He says he is a knight.
He could be a knight,a liar,or a knave.
2:He says he is a liar.
He could only be a knave.
3:He says he is a knave.
He could be a liar or a knave,but not a knight.
Since you are given enough information,2 is the one,and so the native is a knave.
flooble's webmaster puzzle