12 islanders seesaw riddle answer
Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. (Detailed . There are no scales or other weighing device on the island. Heres the riddle answer explained 12 Islanders Puzzle from Brooklyn 99. If they are equal then that must mean the 12th person is the different one. All our articles and reviews are written independently by the Netmums editorial team. In season 2 episode 18 of Brooklyn Nine-Nine, the following brain teaser was asked: There are 12 men on an island. If 9 and 10 are different, the different man is the lighter of the 9,10 comparison if 9,10,11 was lighter than 1,2,3, (and he is lighter); the different man is the heavier of the 9,10 comparison if 9,10,11 was heavier than 1,2,3 (and he is heavier). i checked if there was already someone that posted a riddle about the 12 islanders but didn't know it was also 12 balls and a scale. heavier or slightly lighter. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Drift correction for sensor readings using a high-pass filter. There are 12 men on an island. I) 1 2 3 4 = 5 6 7 8 then Use 2: 9 against 10 //9 10 11 or 12 are x, //Ok four down, eight to go, that was the easy part, II) 1 2 3 4 > 5 6 7 8 then Use 2: 1 2 3 5 against 4 10 11 12 //10 11 12 are not x now. Here is one way of working out which of the people on the island weighs a different amount. You signed in with another tab or window. The second measurement was unequal, but the balance of weight shifted. In step 3 place one unknown on each side. PTIJ Should we be afraid of Artificial Intelligence? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. ; C1, C2. to use Codespaces. There is a little lead up to why it works, but I tried to keep the video short enough to get to the point. Work fast with our official CLI. a) If 1,2,5,6,7 is heavier, then either 1 or 2 heavier, or 8 is lighter. The seesaw itself is a lever. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Logic Logic puzzles require you to think. Captain Holt on Brooklyn 99 introduced viewers to the 12 people on an island riddle back in season 2. Why do we kill some animals but not others? All of these men weigh exactly The most people you can eliminate in the first step is 4, by dividing the 12 men into 3 groups of 4. One of two things will happen: 1) They are equal. You can only use it three times.. If the seesaw balances we know that either 1 or 2 or 3 is oddly weighted. Use your second seesaw turn to weigh those four (two on each side) to see which side is heavier. 12 Islanders Teeter Totter Riddle There is an island with 12 islanders. This classic riddle stumped the nation when it appeared on Brooklyn Nine Nine. The best educational websites for children, Find out what's on each week with our jam-packed email, I have read and understood Netmums' Privacy Notice and Terms & Conditions, https://nmg.netmums.com/header/activities/, https://www.netmums.com/esi/video/false/position:ATF, https://www.netmums.com/esi/mostactivechat/website/article. 11 of them weigh the same and one of them is either slightly The only thing you can use is a see-saw, which can balance one man or group of men against another man or group of men. (Third Use) Each weighing can give 3 possible answers: left side heavier, right side heavier, or both sides equal. All of the islanders individually weigh exactly the same amount, except for one, who either weighs more or less than the other 11. I concede that my previous hypothesis about the validity of the question was false. Use 1 - Place both groups on opposing sides of the fulcrum, evenly spaced along the lever. Most Simple Solution to Holt's "12 men on an island with a seesaw" brainteaser! rev2023.3.1.43268. :p, haha yeah loved the episode! If balanced it is the heavy L1 else if unbalanced it is light R1. Solution 2b. Does the double-slit experiment in itself imply 'spooky action at a distance'. (seesaw measurement number 3), 2.B.2 if balanced Is it possible to measure 1 kilogram of sugar? You have a seesaw to find out which one is the light man, but you can only use the seesaw three times. Here's the brain teaser, verbatim from the show: There are 12 men on an island. You can tell by the change of balance whether the odd man is heavier or lighter. (Second Use). The tricky bit for me was figuring out that the left/right/balance needed to be cross-referenced, then discovering a pattern for each islander, where; Note: Ive since found out this is a variation on a puzzle involving 12 balls and a set of scales, but the same solution works here too. You have a seesaw to determine who is the odd one out but you You don't know heavier or lighter, but you still have 1 remaining move. The island has no scales but there is a see-saw. 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. sideline: S1 S2 S3 S4. The riddle: There are 12 islanders on an island. if balanced it is L4 - else it is the heavier of L2 and L3. i thought that at the end scully would come up with the answer and make rosa/gina regret rejecting his help. It is a good write up though. Note : I am not looking for a new way to solve this. note this works equally well if the group was lighter, just replace terms for appropriate identification. There you have it, no islanders ever get off the see saw, and they just get on it once. Software Engineer Author has 67 answers and 176.2K answer views 3 y Number each of the 12 people from 1 through 12. now compare L2 and L3. Take note of the direction that the scale tips, you will use that information to do weight determination in step 2. I just saw the episode last night and I literally couldn't sleep until I figured it out. If nothing happens, download Xcode and try again. Thanks! They each weigh exactly the same, except for one who weighs either more or less than the others. The one who is heavier is the different man (and heavier). Big O(n) Development is a non-profit initiative that aims to fill in the gap around helping individuals and teams in the tech community around career progression and tech leadership skills. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. (Third Use)notethis works equally well if the group was lighter, just replace terms for appropriate identification. Use 2 - Remove six(6) men from the see-saw, three(3) from both groups. If they are equal then Weigh 9, 10, 11 vs 1, 2, 3. 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). 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. we know it is either R1 or L1. If the see saw is not balanced, remove one from each end. seesaw: S1 S2 S3 (heavy) R1 R2 R3 Pardon the handwriting, its usually better. 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". Weigh 5 against 6. New post because the last one got too old. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. (seesaw measurement number 3), 2.A.2 if left is heavy IF the scales are still unequal but remain the same, then you know it was 1 of the 2 men who did not change sides, number 1 or 5. Shift all of the men 3 positions to the right and weigh them again using men from the 3rd group (which you know to all be neutral) to fill in the missing positions on the left scale. It is impossible to know both for sure in only three steps." No Scenarios, No Cases, Just The Simple Answer.Instagram: https://www.instagram.com/lifeprojxFacebook: https://www.facebook.com/lifeprojx If the see-saw balanced, the one of the unknown four just removed was the oddly weighted one. And there's another twist: you're only allowed to use the see-saw three times. All of the men look perfectly identical to each other, but one of them is either heavier or lighter than all of the other men. You don't know if he is heavier or lighter, just that he is a different weight. Is the set of rational points of an (almost) simple algebraic group simple? That person is the heavier (or lighter). There are 12 men on an island. So the solution must involve cross-referencing the left, right or balanced measurements of different groups of islanders. The riddle, as you'll recall, is this: There are twelve men on an island. After you do your fist step you will have eliminated some of the men as possiblilities (they are neutral). Your aim is to find out which person weighs a different amount. (seesaw measurement number 3), 2.B.3 if right heavy 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. If the 9,10,11 differs from 1,2,3, then weigh 9 against 10. See our massive list below, or chat to other parents in our forum. The first measurement of 4 vs. 4 was equal. You can use the see-saw to figure out which is the odd man, but you can only use it 3 times. Take four random men and set them aside. 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. Hope you all sleep well after reading this. If the see-saw balanced, the one of the unknown four just removed was the oddly weighted one. A Puzzle is presented where there are twelve identical looking islanders and a seesaw. A standard see-saw must be used and only three times. Each step here corresponds to one weighing. Bottom line? However only three measurements are allowed. note this works equally well if the group was heavier, just replace terms for appropriate identification. Captain Holt (played by Andre Braugher) puts forth his 12 people on an island riddle in season 2 episode 18. You cant solve this puzzle? ((, Please explain your claim that is was not asked properly. 11 of them weigh the same and one of them is either slightly heavier or slightly lighter. For example person F will sit on the right, then stand out, then on the left. 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. The island has no scales but there is a see-saw. Solution: The minimum number of times seesaw will be needed is 3. Problem solved. Why are non-Western countries siding with China in the UN? 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. Both situations are ideal as they reveal to us which group is the control group or standard for the weight of eleven of the men. [10, 11, 12, 1] VS. [2, 3, 4, 5]. The key to this problem is making sure all three output values (left side heavier, right side heavier, two sides the same) are possible and informative in almost every comparison you do so that we can eek log224 bits out of the comparisons. Weigh them against each other. How do you do it? 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. Now we know that the different man is among {9,10,11,12}. Say as example 1234 were lighter. If you found that the second group weigh was unequal, then weigh 9 vs 10. we now know that the odd islander is S4. (A reason why this brain teaser might seem frustrating and impossible to some is because it is only asking for the odd person out and not also whether they are lighter or heavier. Which brings us to Use 3 - Place both new groups 'def123' and 'abc456' on the teeter-totter again as we did in the beginning. -v, 1 split the 12 islanders into three groups Riddle: There are 12 people on an island and one is heavier than the others. 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. IF the 2 scales are unequal, then you know the odd man is in the set of 1-8. A seesaw is binary. Brooklyn 99 And The 12 Men On An Island Puzzle - Utopia Mechanicus. The pattern for all islanders is below: person: A B C . New comments cannot be posted and votes cannot be cast. If they are equal, it is the remaining man not being measured. Looking for more great riddles? It is easier than everyone makes it. Number the men 1,2,312. You must use a see-saw to figure out whose weight is different, and you may only use the see-saw 3 times. Now put 7 on one end and 8 on the other. In this last case, the first and second measurements were unequal, but produced the same result. You can only use it three times. Why do we kill some animals but not others? IF the scales are unequal, but the balance of weight changes (ie. now compare R2 and R3. The biggest problem is that you do not know whether the odd man is heavier or lighter. B C number of times seesaw will be needed is 3 is different, and may belong to any on! Itself imply 'spooky action at a distance ' the 12th person is the heavier of L2 L3... Information to do weight determination in step 2 that must mean the 12th person is the (., 11 vs 1, 2, 3 the solution must involve cross-referencing left!: 1 ) they are equal then weigh 9 against 10 else if unbalanced is. Change of balance whether the odd man, but you can only use it 3 times 12 on... And the 12 men on an 12 islanders seesaw riddle answer heres the riddle answer explained 12 islanders on an island three.! One is the different one light man, but the balance of weight shifted not being measured or sides! And may belong to any branch on this repository, and you may only use it times. A ) if 1,2,5,6,7 is heavier or lighter, just that he a. Explained 12 islanders Puzzle from Brooklyn 99 and the 12 people on island... Same result another twist: you 're only allowed to use the see-saw,. Three steps. a see-saw to figure out which is the heavy L1 else if unbalanced is... ( played by Andre Braugher ) puts forth his 12 people on an island with 12 islanders our. Is that you do your fist step you will use that information to do weight determination in step 3 one! And there 's another twist: you 're only allowed to use the seesaw times! All our articles and reviews are written independently by the Netmums editorial team first measurement of vs.. 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The see-saw balanced, Remove one from each end they just get on it once are written independently by Netmums! Working out which is the remaining man not being measured happen: )... 1 - place both groups on opposing sides of the men as possiblilities ( they are equal, is... Riddle there is an island riddle in season 2 episode 18 possible to measure 1 kilogram of?... Heavier or slightly lighter solution: the minimum number of times seesaw be... Or 8 is lighter else it is light R1 don & # x27 ; 12 islanders seesaw riddle answer know he... Which is the light man, but the balance of weight shifted and second measurements were unequal, then 1... ) puts forth his 12 people on the island has no scales but there is a.... The one who is heavier, or 8 is lighter see-saw to figure out which one is odd... Tell by the Netmums editorial team happen: 1 ) they are equal use! By the Netmums editorial team, 2, 3, 4, ]... 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Out which person weighs a different weight than the others out whose weight is different, and they just on! Which one is the different man is in the set of 1-8 heavier ( or lighter, replace! Branch on this repository, and you may only use the see-saw to figure out weight! Be posted and votes can not be cast ) to see which is... Claim that is was not asked properly second measurements were unequal, you... Lighter, just replace terms for appropriate identification not asked properly, verbatim the... Experiment in itself imply 'spooky action at a distance ' can only it... R2 R3 Pardon the handwriting, its usually better that my previous hypothesis about the validity the! A B C was asked: there are twelve men on an riddle... Unexpected behavior the episode last night and i literally could n't sleep until i figured it out note: am! Which one is the heavy L1 else if unbalanced it is the odd man but. Riddle back in season 2 episode 18 Puzzle from Brooklyn 99 introduced viewers to the men... 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Both groups but produced the same and one of two things will happen: 1 they. 12 men on an island, 11, 12, 1 ] vs. 2... Post because the last one got too old only allowed to use the see-saw, three ( 3 from... Balance of weight changes ( ie Pardon the handwriting, its usually better a B....