You are at one end of a hall blindfolded. At the other end are Alex and Bert. You are allowed to ask any yes or no questions you want, but only one of them will respond. They are standing next to each other and their voices are identical, so you have no way of telling which one responded by sound alone.

Using as few questions as possible, find out the type of each Alex and Bert and who answered your last question.

first ask "Who would your partner say is a liar?"
the oposite of his answer will always be true.
second ask "Who would your partner say is answering this question?" again the oposite will be true.
eg. where bert lies and answers second
answer to question one "He would say that alex lies"
answer to question 2 "He would say Alex answered this question"

Posted by rerun141 on 2003-12-30 13:30:20