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.

in donmike's second question doesn't prove anything as you don't know whos answering
pennies question doesn't establish whos the liar and whs the knight....
ghanging my original answer to yes or no form you could ask:
"Would your partner say that you alex is the liar?"
"Would your partner say that alex is answering this question?"

Posted by rerun141 on 2003-12-30 15:03:16