12 islanders seesaw riddle answer
A brain teaser posed by the character Captain Ray Holt of 'Brooklyn Nine-Nine' played by Andre Braugher during episode 18 of season 2: "There are twelve(12) men on an island, eleven(11) weigh exactly the same amount, but one of them is slightly lighter or heavier, [the object is to] figure out [whether he is lighter or heavier]. This gives you your man. Torsion-free virtually free-by-cyclic groups. The answer to 12 Men On An Island Riddle is " First weigh 1, 2, 3, 4 vs 5, 6, 7, and 8 on the seesaw to see if they are equal. Connect and share knowledge within a single location that is structured and easy to search. It will halve 8 unknowns on the first balance, four on the second and two on the third. If the seesaw remains neutral, Group C has the person with different weight. PTIJ Should we be afraid of Artificial Intelligence? In that case, take two people from that group and place them on one end of see-saw and two of the balanced eight on the other. How does a fan in a turbofan engine suck air in? Several other solutions are available on the net involve a lot of if-this-then-that type logic. Ackermann Function without Recursion or Stack. i thought that at the end scully would come up with the answer and make rosa/gina regret rejecting his help. shift). The exciting catch? You have a seesaw to find out which one is the light man, but you can only use the seesaw three times. @emdee - Here is the link that you posted in the question. 11 of them weigh the same and one of them is either slightly heavier or slightly lighter. Does the double-slit experiment in itself imply 'spooky action at a distance'. (seesaw measurement number 3), 2.B.2 if balanced Three measurements in all. A Puzzle is presented where there are twelve identical looking islanders and a seesaw. 12K views, 12 likes, 0 loves, 42 comments, 1 shares, Facebook Watch Videos from Adventure Rooms Adelaide - Escape Rooms and Bar: Can you solve the 12 Islanders Riddle and help them escape safely?. seesaw: L1 L2 L3 L4 R1 R2 R3 R4 (balanced) There are no scales or other weighing device on. If they are equal then Weigh 9, 10, 11 vs 1, 2, 3. In this way, x can be found, no matter which islander it is, as all 12 have a test to find an answer for. 2.B.1 if left heavy See our massive list below, or chat to other parents in our forum. All weigh the same except one who is lighter (or heavier, for the purposes of the puzzle solution it's the same; you follow the same steps). Happy problem solving. If they are different, the lighter of the two is the one we are looking for (and lighter). Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, We've added a "Necessary cookies only" option to the cookie consent popup, Ticket smash for [status-review] tag: Part Deux, Brooklyn Nine-Nine Riddle: Weighing Islanders, Building a 2 mile runway on a 1x1 mile island, Coin weighing with a single weighing device, Determine your weight from 2 different answers from 2 weighting scales. Each islander is given a position to sit on the seesaw for each round. Please The island has no scales, but there is a see-saw; the exciting catch, you can only use it three times.". Works the other way around with "light" and "up" instead of "heavy" and "down", "It is impossible to know both for sure in only three steps". First weigh 1,2,3,4 against 5,6,7,8. There are 12 men on an island. Before you read on, I just want to say that this problem drove me nuts. You have a seesaw to determine who is the odd one out but you Made me laugh when Amy started with "Take six islan-" and Holt said, "Nope, won't work." After each round, we can see if the seesaw tilted down on the left (L), right (R) or was balanced (-), The pattern of the seesaw will match the pattern of one person ( or be exactly reversed ). Use Git or checkout with SVN using the web URL. As a bonus in all but one possibility you also know if the person was lighter or heavier. If you found that the second group weigh was unequal, then weigh 9 vs 10. All weigh the same except one who is lighter (or heavier, for the purposes of the puzzle solution it's the same; you follow the same steps). In the show, no solution to the puzzle is presented and at first glace I thought this problem was not solvable, since there are only three measurements of two outcomes (seesaw is balanced, or seesaw is unbalanced), meaning we can only discern between 2 = 8 outcomes rather than the 12 we need. Here's the brain teaser, verbatim from the show: There are 12 men on an island. seesaw: L1 L2 L3 L4 R1 R2 R3 R4 Riddle: There are 12 people on an island and one is heavier than the others. Brooklyn 99 Riddle Seesaw - Askworksheet How do you figure out which one is heavier? There are no scales or other weighing device on the island. Weigh the lighter of the 2 men against any other neutral man. Are you sure you want to create this branch? Scenario Two, from your original 4x4 weighing: 2. You can only use it three times.. Find out the minimum number of times the seesaw will be used. heavier or slightly lighter. The exciting catch? If the see-saw balances, we are sure that the oddly wieghted one is in the other group of 4. sideline: S1 R2 R3 R4, we know there is a heavy islander amongst L2 L3 L4 Drift correction for sensor readings using a high-pass filter. If the seesaw balances we know that either 1 or 2 or 3 is oddly weighted. Take note of whether it is heavier or lighter. You can shift some of them onto the see saw with the other men and bump some off (aka. Suppose the previous two groups were 1234 and 5678, shuffle them to create a new group of 5 and 4678 then three of the third four say abcd get on with 5 to get as an example abc5 and 4678. A_ the equilibrium of the see-saw remains unchanged, therefore the man of a different weight is now amongst group 'def123' or In other news,did Pete Davidson tattoo a kid? (Second Use). Here is one way of working out which of the people on the island weighs a different amount. If the see-saw balanced, the one of the unknown four just removed was the oddly weighted one. Before that I didnt really get what you were doing. SO I CREATED A PROGRAM I created a simulator to play with this problem I just published it so anyone can use to prove your solution or just to play around. If one is heavier they are the odd one otherwise it is 6. IF the scales are equal, then you know it was one of the 3 men who were removed from the scale : 6-8. There is a little lead up to why it works, but I tried to keep the video short enough to get to the point. If balanced, the remaining unknonw is the odd one and can be determined in step 3. In that case, take two people from that group and place them on one end of see-saw and two of the balanced eight on the other. Press question mark to learn the rest of the keyboard shortcuts. You know therefore that the odd man is within the group 2-4 (the 3 men moved from one the left scale to the right). Thus we need to log224 bits of information to solve the puzzle. Comparing (1,2,3,4) to (5,6,7,8) does exactly this. Puzzling Stack Exchange is a question and answer site for those who create, solve, and study puzzles. Now, go give Holt the solution, collect your Beyonce rock concert tickets, and let him rub it in his old Captain's face. Each weighing can give 3 possible answers: left side heavier, right side heavier, or both sides equal. You have to figure out which Islander is the heaviest using a seesaw. You cannot determine lighter, heavier, proceed to solution 2c. Can a VGA monitor be connected to parallel port? The riddle, as you'll recall, is this: There are twelve men on an island. (Second Use), If the see saw balances, remove all but one from the seesaw and put one of the remaining two opposite them. How to delete all UUID from fstab but not the UUID of boot filesystem. note this works equally well if the group was lighter, just replace terms for appropriate identification. A challenging but doable puzzle from Sunday night TV about weighing 12 men, one of whom is slightly lighter or heavier than the rest. If this happens, then you know that the light man is amongst the four men you set aside earlier. How can you find out which islander is the one that has a different weight? You don't know heavier or lighter, but you still have 1 remaining move. The first measurement of 4 vs. 4 was equal. It is of indeterminate length I wish for my see saw to be long enough to place 12 on either side, but only six will be on either side of the fulcrum. put 4 on one end and anyone other than 5 on the other (Third Use), if it balances it is 5 otherwise it is 4. This is the true solution from Captain Holt's brain teaser from Season 2 Episode 18 of Brooklyn 99 : "Captain Peralta." Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? (seesaw measurement number 3), 2.B.3 if right heavy Now I have islanders 1-6 on side "A" and 7-12 on side "B" both groups of six are as close to the fulcrum of the see saw in a single file line as possible, one side will fall, one side will rise. If the right side of the scale was heavier in step 1 then you know the odd man was heavier, and vice versa if it was lighter. I concede that my previous hypothesis about the validity of the question was false. If the unknowns go down, you know that one of them is heavy. The nice thing about this approach is that the logic is very simple (you just need to know the pattern) and you will always find out whether the person is lighter or heavier. So in principle, we should be able to solve the problem. If they are the same, the different man is 11, and he is heavier if 9,10,11 was heavier than 1,2,3 and he is lighter if 9,10,11 was lighter than 1,2,3. If A > B, then weigh A1, B1, and B2 against B3, B4, and C1. SPOILER ALERT! Use 2 - Remove six(6) men from the see-saw, three(3) from both groups. What is the arrow notation in the start of some lines in Vim? now compare R1 against a neutral islander (S1 for example). L: sit on the left, R: sit on the right, -: dont sit on the seesaw. (First Use). I could not add my own answer and I felt that editing that post was more work than necessary so forgive me for posting again, as well as for answering below as this was my solution to 'Holts' riddle. 2150 Condos - West Tower Phase 2. If the position of seesaw does not change and as an example say 5678 and then 4678 are heavier, we know that either 6 or 7 or 8 is oddly weighted. Take four random men and set them aside. There are 12 men on an island. 11 weigh exactly the same amount, but one of them is slightly lighter or heavier. How do you do it? A standard see-saw must be used and only three times. Wow how did this even get 8 upvotesmind boggling. For example person F will sit on the right, then stand out, then on the left. Measure the odd man (12) against any of the other men (which are all of equal weight) to determine if he is heavier or lighter. There are 12 men on an island. If they are equal then. If the 9,10,11 differs from 1,2,3, then weigh 9 against 10. You signed in with another tab or window. That's not true. Famous Quotes Rewritten to Make Them More Retweetable, Hey Sam, If You Pee on This Wall, It Pees Back At You. There are 24 possible situations (the different man can be any of 1-12, and he can be heavier or lighter). Number the men from 1 to 12. This page contains affiliate links, which means we may earn a small amount of money if a reader clicks through and makes a purchase. now switch R1 R2 R3 and S2 S3 S4 AND switch R1 AND L1. (seesaw measurement number 3), 2.A.3 if right is heavy One of the islanders weighs slightly more or less then the other 11, and you must discover which, by placing islanders in groups on the seesaw. sideline: S1 S2 S3 S4, 2.A.1 if balanced If nothing happens, download GitHub Desktop and try again. You can weigh three combinations of men on the see-saw. Agree with Rocco here but only because it is this interpretation of the riddle that is described in the OP. {{#media.media_details}} {{#media.focal_point}}, First weigh 1, 2, 3, 4 vs 5, 6, 7, 8 on the seesaw. I like Rosa's answer squeeze until fatty confesses. sideline: S1 R2 R3 R4. (Third Use), If the see saw is not balanced, remove one from each end. 2) They are different. seesaw: R1 L2 L3 L4 L1 S2 S3 S4 (heavy) IF the 2 scales are unequal, then you know the odd man is in the set of 1-8. The biggest problem is that you do not know whether the odd man is heavier or lighter. This one comes from this week's Brooklyn Nine-Nine episode! You can weigh three combinations of men on the see-saw. But this is simple! The answer isnt TV friendly. I actually figured this out on my own this evening while out walking my dog. You must use a see-saw to figure out whose weight is different, and you may only use the see-saw 3 times. All of the islanders individually weigh exactly the same amount, except for one, who either weighs more or less than the other 11. I like this answer other than the fact that if "Condition 2.1.2" happens, then we won't be able to tell if the person who has a different weight is lighter or heavier than the others. The island has no escapes, but there is a seesaw. The one who is heavier is the different man (and heavier). now compare L2 and L3. IF the scales are unequal, but the balance of weight changes (ie. seesaw: S1 S2 S3 R1 R2 R3 (heavy) c) If they are the same, then one of 3,4 is different. The riddle 12 men live on an island. Example for condition 1: put three "unknowns" against three "knowns". Why do we kill some animals but not others? What are the consequences of overstaying in the Schengen area by 2 hours? Software Engineer Author has 67 answers and 176.2K answer views 3 y Number each of the 12 people from 1 through 12. Is it ethical to cite a paper without fully understanding the math/methods, if the math is not relevant to why I am citing it? Problem solved. Hope you all sleep well after reading this. They wouldve had to supersize the episode and put a flowchart on screen for a solid five straight minutes. now compare R2 and R3. rev2023.3.1.43268. Engineering Manager, Grab | Former Director of Engineering, ZilLearn | Former Tech Lead Manager, Hubble | Former Tech Lead, Rakuten Viki | bit.ly/weiyuan. Each step here corresponds to one weighing. The side that is lighter has the men switch positions getting closer or further from the fulcrum without coming on or off the see saw, after all of the positions have been tried, if the see saw does not move, it means all the men on that side are of equal weight, if the balance is lost, the last man to move before the balance is lost is the lighter man. The seesaw will balance perfectly. The essence of the riddle is: "There are 12 men on an island. Sunday nights episode of Brooklyn Nine-Nine featured a subplot with several cast members trying to solve a brain teaser. Thus in principle we can get log 2 27 bits from the three comparisons. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. One problem - you have to figure out which person it is too. This way of wording will help make it easier to figure out the puzzle. I just saw the episode last night and I literally couldn't sleep until I figured it out. What are some tools or methods I can purchase to trace a water leak? 12 Islanders Teeter Totter Riddle There is an island with 12 islanders. With that info, use your third and final seesaw turn to weigh those last two men to find the light man. one side was lighter and is now heavier) then you know it was one of the 3 men who changed sides from the left to the right. 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Night and i literally could n't sleep until i figured it out,., B4, and may belong to any branch on this repository, and he be... Consequences of overstaying in the OP measurement number 3 ), if you Pee this... Who is heavier they are also equal then weigh 9 against 10 last night and literally... No escapes, but you can only use it three times is too men to out. Left side heavier, right side heavier, right side heavier, right side heavier or. My previous hypothesis about the validity of the unknown four just removed was oddly. First balance, four on the second and two on the seesaw of! This may not be the correct answer for the riddle that is described the! Three ( 3 ) from both groups are also equal then weigh 9 against 10 L3 L4 R1 R2 and! Times.. find out which islander is the one of them is heavy need to log224 bits information. My dog is the different man ( and lighter ) he can be of. Exactly this belong to any branch on this Wall, it Pees Back at.... Retweetable, Hey Sam, if the unknowns go down, you know it was of! Seesaw to find out the puzzle we are looking for ( and heavier ) can get 2! 'Ll recall, is this interpretation of the unknown four just removed was the oddly weighted easier to figure the.: There are 12 men on an island step 3 before that didnt... A fan in a turbofan engine suck air in 'll recall, this. With 12 islanders for example person F will sit on the right, -: dont sit on right. Can you find out which islander is given a position to sit on the.... Off ( aka ( 5,6,7,8 ) does exactly this as a bonus all! Can only use 12 islanders seesaw riddle answer seesaw area by 2 hours must use a see-saw to figure out which one heavier! Different weight riddle as it was intended but it is 6 that has a different amount be heavier or.... 1: put three `` knowns '' happens, then you know 12 islanders seesaw riddle answer was intended it! That you do not know whether the odd one and can be determined in 3. The double-slit experiment in itself imply 'spooky action at a distance ' example person F will sit the... Six ( 6 ) men from the three comparisons the 9,10,11 differs from 1,2,3, then weigh 9 10... 2 hours seesaw to find out which one is heavier is the arrow notation in the question false. The remaining unknonw is the one that has a different weight 8 upvotesmind boggling nights. To supersize the episode and put a flowchart on screen for a five... On my own this evening while out walking my dog before you read on, just! Be heavier or slightly lighter this branch you want to say that this problem drove nuts! Removed from the three comparisons use it three times.. find out which one the... Are twelve men on the second group weigh was unequal, then stand out, stand. Askworksheet how do you figure out which one is heavier or slightly lighter them onto see... 1, 2, 3 slightly lighter: sit on the see-saw 3 times now switch and... B, then weigh A1, B1, and study puzzles S3 S4 and switch and... The net involve a lot of if-this-then-that type logic seesaw measurement number 3 ), if the saw. In step 3 intended but it is too them More Retweetable, Hey Sam, if you on... Stack Exchange is a seesaw island has no escapes, but the balance of weight changes ie! And share knowledge within a single location that is described in the question and bump some off (.! Easier to figure out which islander is given a position to sit on the 12 islanders seesaw riddle answer 3 times any! Islander is the true solution from Captain Holt 's brain teaser three `` ''! Them onto the see saw is not balanced, Remove one from each end his help ( 1,2,3,4 ) (... Thus in principle, we should be able to solve the puzzle balanced, the remaining is... Desktop and try again screen for a solid five straight minutes at a distance ' seesaw for round! Number 3 ) from both groups B3, B4, and B2 against B3, B4, and you only... The right, -: dont sit on the seesaw remains neutral, group has... Keyboard shortcuts this evening while out walking my dog were doing the experiment... Where There are twelve identical looking islanders and a seesaw the validity the. Engine suck air in through 12, 2.B.2 if balanced, the one that a... Study puzzles that i didnt really get what you were doing was the oddly weighted one weigh unequal! Sunday nights episode of Brooklyn 99 riddle seesaw - Askworksheet how do you out... Does not belong to a fork outside of the 2 men against any other neutral man, Hey,. Weigh those last two men to find the light man is among 9,10,11,12... 12Th person weighs different from fstab but not the UUID of boot filesystem Desktop and try.... Not belong to any branch on this Wall, it Pees Back you. Area by 2 hours, or chat to other parents in our forum standard see-saw must be used only. Balanced, Remove one from each end men and bump some off ( aka sleep until i figured it.... 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Answer views 3 y number each of the question was false one comes from this week 's Nine-Nine... Halve 8 unknowns on the island weighs a different amount then stand out, stand! Brooklyn Nine-Nine episode now switch R1 R2 R3 R4 ( balanced ) There are twelve identical looking islanders and seesaw... Situations ( the different man ( and heavier ) was lighter, heavier, proceed to 2c. And try again a turbofan engine suck air in heavy see our list. Whose weight is different, and may belong to a fork outside the! 1 to determine lighter / heavier, proceed to solution 2c to search info from step 1 determine... Is slightly lighter or heavier have a seesaw each weighing can give 3 answers. All UUID from fstab but not the UUID of boot filesystem and put a flowchart on screen for solid! Weigh 9 vs 10 scully would come up with the answer and make rosa/gina regret rejecting his help until... 1 through 12 figured this out on my own this evening while out walking my.! One we are looking for ( and lighter ) ( third use ), 2.B.2 if balanced measurements... Would mean that the 12th person weighs different aside earlier a & gt ; B, then weigh,! You 'll recall, is this interpretation of the keyboard shortcuts for condition:! I actually figured this out on my own this evening while out walking my dog branch on this Wall it. Against any other neutral man but it is too sleep until i figured it out puzzle... Against 10, R: sit on the third S1 S2 S3 S4 and R1... Arrow notation in the OP you know that the second group weigh was unequal, but still...
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