The truth-teller will also answer yes if the road is the correct one. If the fork is the correct one, a liar would answer no to the direct question ‘does this road lead to the village?’ and thus his (lying) answer to the actual question must be yes.
This works: point at one of the forks and ask the native: “If I were to ask you if this road leads to the village, would you say yes?” Solution: The challenge here is to find a question that forces a liar to lie about a lie and hence tell the truth. From the reply he knows which road to take. The logician thinks a moment, then asks one question only. He has no way of telling whether the native is a truth-teller or a liar. He comes to a fork in a road and has to ask a native bystander which branch he should take to reach a village. Members of one tribe always tell the truth, members of the other always lie. If you get two bolts, or screws, and try it, it’s fun to see.Ī logician vacationing in the South Seas finds himself on an island inhabited by two proverbial tribes of liars and truth-tellers. The movements cancel each other out – like a person walking up an escalator at the same rate that it is moving down. The heads of the twiddled bolts move neither inward nor outward. (c) remain the same distance from each other?
If you move the bolts around each other as you would twiddle your thumbs, holding each bolt firmly by the head so that it does not rotate and twiddling them in the direction shown, will the heads Two identical bolts are placed together so that their helical grooves intermesh as shown below. But with three there is always a matching pair since either you will have chosen three of the same colour, or a matching pair and an odd one out. With two socks it is possible to have one red and one blue. What is the smallest number of socks you must take out of the drawer in order to be certain that you have a pair that match? The room is in pitch darkness and you want two matching socks. The 20 socks are exactly alike except for their colour. Ten red socks and ten blue socks are all mixed up in a dresser drawer.
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