## Search found 31 matches

- Fri Nov 30, 2018 6:27 pm UTC
- Forum: Logic Puzzles
- Topic: Wines
- Replies:
**1** - Views:
**814**

### Re: Wines

If we have some number with prime factorization a n *b o *c p *... Then the number of positive integer factors is (n+1)*(o+1)(p+1)*... Since 7 is prime, the only solution is a single prime number taken to the 6th power. 2 6 =64, and using any other prime gets a number greate...

- Mon Nov 26, 2018 4:47 pm UTC
- Forum: Logic Puzzles
- Topic: Car
- Replies:
**3** - Views:
**940**

### Re: Car

3 cars. Not maximally efficient Optimization: Let's look at the middle trip of Car C. It travels some distance x, transfers enough fuel to Car B to travel x distance, and travels x distance back to refuel. Car B splits the fuel with Car A, letting them each travel an extra x/2 distance. This sh...

- Mon Oct 29, 2018 3:49 pm UTC
- Forum: Logic Puzzles
- Topic: Sacrifice
- Replies:
**8** - Views:
**4855**

### Re: Sacrifice

Smartass solution: We only need two chickens. Chicken one takes a sip from half the canisters. If it show symptoms, the other half are known to be safe which should buy time for the other chicken to test the unsafe canisters one at a time. If it doesn't show symptoms, those canisters are known t...

- Mon Oct 22, 2018 6:40 pm UTC
- Forum: Logic Puzzles
- Topic: Survival
- Replies:
**1** - Views:
**5889**

### Re: Survival

Use 100L to fill the engine and attached canister. Drive 50L worth uphill, remover canister with remaining 50L. Return. Use another 100L to fill engine and another canister which you attach. Drive 75L worth uphill, remove canister with remaining 25L. Return. Use final 100L to fill engine and anothe...

- Fri Sep 14, 2018 12:33 am UTC
- Forum: Gaming
- Topic: Cyber Tank - please help !!!!
- Replies:
**20** - Views:
**2798**

### Re: Cyber Tank - please help !!!!

Could you please explain how you use only 4 boxes to cross the river?? Box 1 makes a bridge on the left hand side of the river. Box 2 goes across this bridge, onto the conveyor belt and you then go back round, above it and push it down one square, to stop the left hand cannon shooting you. Use box ...

- Thu Sep 13, 2018 8:13 pm UTC
- Forum: Gaming
- Topic: Cyber Tank - please help !!!!
- Replies:
**20** - Views:
**2798**

### Re: Cyber Tank - please help !!!!

I use all 5 boxes to get across, so I need another blocker so I can get down to last crystal in bottom right hand corner - can you reach it, 'cos it looks like you're doing it same way as me?? You should only need four of the boxes to cross the river. That leaves one box and two downward facing can...

- Sun Jul 16, 2017 2:38 pm UTC
- Forum: Logic Puzzles
- Topic: New kind of puzzle
- Replies:
**17** - Views:
**6046**

### Re: New kind of puzzle

If we generate randomly a board 8x8 with 16 circles of each of the 4 colors are we sure to find at least one solution? Clearly not. The rules for line length give us at most 24 possible targets from a single circle. That's not so bad, but circles near an edge have less - in the most extreme case, a...

- Wed Jun 14, 2017 3:47 pm UTC
- Forum: Logic Puzzles
- Topic: Guess the Pattern
- Replies:
**21** - Views:
**7628**

### Re: Guess the Pattern

1,042, 7 1,043, X 1,044, 5 1,045, X 1,046, 3 7, 5, X, 3 There seem to be discrepancies in the newest batch as well. ----- 10^6, 3 10^6+1, X Huh. I expected it to be significant that an X shows up IFF the previous output was bigger than three, but I guess that pattern must have been a fluke of the l...

- Tue Jun 06, 2017 6:34 pm UTC
- Forum: Logic Puzzles
- Topic: Guess the Pattern
- Replies:
**21** - Views:
**7628**

### Re: Guess the Pattern

Below that is the same information set up as a sequence.

I see an 11 in the lower sequence, but none in the list. Are you sure everything is written correctly?

- Wed Feb 01, 2017 8:29 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1793: "Soda Sugar Comparisons"
- Replies:
**132** - Views:
**24019**

### Re: 1793: "Soda Sugar Comparisons"

That's way off from the amount of sugar in the soda, so Randall must've calculated the amount of sugar in a gallon of whole Skittles. Or he messed up a calculation. Or I did. Some searching turned up that even a random packing of M&Ms manages a 68% packing efficiency . Even after assuming Skitt...

- Wed Jan 18, 2017 6:12 pm UTC
- Forum: Logic Puzzles
- Topic: New puzzle : Equalize
- Replies:
**13** - Views:
**5777**

### Re: New puzzle : Equalize

Here's my solution for the example puzzle: r3r1r4b3 r1 b3 r4b1r2b4 r4b1r2 r3b4r1r2 r2 b1b2b3b2 b1 b3 The official scores of it are red: -13 blue: -13 if I added it up correctly. In order to narrow down the possibilities I had to guess the first two tile placements. After that the remaining six were ...

- Wed Jan 18, 2017 4:41 pm UTC
- Forum: Logic Puzzles
- Topic: New puzzle : Equalize
- Replies:
**13** - Views:
**5777**

### Re: New puzzle : Equalize

Thank you very much for your comments. The puzzle is derived from a game I designed recently. Is an abstract 2 players game with few rules (2 exactly). To avoid mirroring effect there is another variant of the puzzle where the tiles are numbered : For each color : 2 have a multiplier 1 2 have a mul...

- Tue Jan 17, 2017 6:06 pm UTC
- Forum: Logic Puzzles
- Topic: New puzzle : Equalize
- Replies:
**13** - Views:
**5777**

### Re: New puzzle : Equalize

The opposite color count for - 1 each. If the only point of the values is to have red and blue equal, then this rule is irrelevant as the other square suffers an equal penalty. This should simplify things quite a bit. EDIT: After thinking about it more, I'm pretty sure the only thing that matters i...

- Fri Dec 30, 2016 7:09 pm UTC
- Forum: Logic Puzzles
- Topic: Maximizing Targeted Return
- Replies:
**5** - Views:
**3999**

### Re: Maximizing Targeted Return

The actual question was being able to invest at the end of each round, with the cost of investment going up by a certain amount (in this case, 2 coins each time). Yeah, I was avoiding that because applying my method to repeated investment results in compound interest on fractional investments, so t...

- Fri Dec 30, 2016 4:13 pm UTC
- Forum: Logic Puzzles
- Topic: Maximizing Targeted Return
- Replies:
**5** - Views:
**3999**

### Re: Maximizing Targeted Return

It’s been at least 25 years since I have done any sort of math more complicated than simple derivatives, so I just don’t know how to even go about tackling this situation. Let’s say that there is a game that allows you to earn coins at a certain rate, and the ability to spend coins to increase that...

- Mon Dec 05, 2016 6:49 pm UTC
- Forum: News & Articles
- Topic: 2016 US Presidential Election
- Replies:
**8482** - Views:
**1070491**

### Re: 2016 US Presidential Election

Assuming someone is part of a specific culture based solely on the color of their skin is, in fact, technically racism. Reevaluating that assumption based on later evidence may make it slightly less racist, but the non- racist approach would be to require that evidence to identify them as a member ...

- Mon Dec 05, 2016 3:37 pm UTC
- Forum: News & Articles
- Topic: 2016 US Presidential Election
- Replies:
**8482** - Views:
**1070491**

### Re: 2016 US Presidential Election

Until that exemption is given, members of the culture are consider suspect ... Technically, that's not racism. It's culture, not race! The negatives are not literally considered to be born in, Assuming someone is part of a specific culture based solely on the color of their skin is, in fact, techni...

- Mon Oct 31, 2016 3:16 pm UTC
- Forum: News & Articles
- Topic: 2016 US Presidential Election
- Replies:
**8482** - Views:
**1070491**

### Re: 2016 US Presidential Election

early voters aren't allowed to change their minds. That depends on where you live and how close to the election we are talking about. For example, Minnesota has the following: WHAT IF I RETURNED MY BALLOT AND WANT TO CHANGE MY VOTE? You can ask to cancel your ballot until the close of business one ...

- Thu Oct 13, 2016 5:59 pm UTC
- Forum: Logic Puzzles
- Topic: Solitaire game
- Replies:
**4** - Views:
**3488**

### Re: Solitaire game

I supposed if you can calculate v fast enough, you could make a strategy relating to whether the next ball you add has v=-1 or not. There's no point. The next ball you add will always have one of two possibilities: one more than the highest you have seen, or some number you have already removed. Th...

- Fri Oct 07, 2016 5:48 pm UTC
- Forum: Logic Puzzles
- Topic: Maya Cosmic Number Puzzles
- Replies:
**5** - Views:
**3964**

### Re: Maya Cosmic Number Puzzles

00 __ __ __ 56 __ 42 __ 11 __ 04 __ __ __ __ __ __ __ 15 __ 01 __ 40 __ 33 __ 26 __ 65 __ 51 __ __ __ __ __ __ __ 62 __ 55 __ 24 __ 10 __ __ __ 66 Rules 1. No first digit is repeated in any row or column. 2. No Second digit is repeated in any row or column. 3. No two digit combination is repeated. ...

- Wed Sep 28, 2016 4:40 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1739: "Fixing Problems"
- Replies:
**26** - Views:
**8284**

### Re: 1739: "Fixing Problems"

My favorite form of the sentiment that this comic expresses is the Programmer's Drinking Song : 100 little bugs in the code, 100 bugs in the code, fix one bug, compile it again, 101 little bugs in the code. 101 little bugs in the code..... Repeat until BUGS = 0 So, about 65436 rounds? Your voice mu...

- Wed Sep 28, 2016 3:49 pm UTC
- Forum: Mathematics
- Topic: Pay to Win - a game theory problem
- Replies:
**21** - Views:
**5700**

### Re: Pay to Win - a game theory problem

Double defect has to be the standard for comparison, because it is the worst you have to threaten your opponent with. If you have 10 and the other player has 100, and you demand that he promises you $50 or you'll ruin everything by cooperating, he just defects and accepts his $100. He doesn't get $...

- Mon Sep 12, 2016 7:55 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1732: "Earth Temperature Timeline"
- Replies:
**540** - Views:
**105894**

### Re: 1732: "Earth Temperature Timeline"

Can someone give a dumbed down explanation of how they know the temperatures in prehistoric times? I am hoping we're not using some circular logic, Estimating future temperature increases based on CO2 levels, based on changes from historical temperatures which we calculated based on CO2 levels. Bas...

- Tue Sep 06, 2016 6:00 pm UTC
- Forum: Mathematics
- Topic: Pay to Win - a game theory problem
- Replies:
**21** - Views:
**5700**

### Re: Pay to Win - a game theory problem

Both players write down a number, and hand it to the other player at the same time. The one who wrote the lower number cooperates, and the other gives him half of that number in dollars. Suppose one player is considering writing a number higher than his real number. If the new number still ends up l...

- Thu Aug 11, 2016 2:18 pm UTC
- Forum: Logic Puzzles
- Topic: Sharing secret information publicly
- Replies:
**27** - Views:
**6426**

### Re: Sharing secret information publicly

No need to use modulo. Odd and even sums could solve the problem. A (or B) when they claim the sum is Even (or Odd) there are 4 possibilities : If the sum of the 3 cards is even then A (or B) would have : 1. Odd-Odd-Even 2. or Even Even Even As there are 3 Even numbers (2,4,6) and 4 Odd numbers (1,...

- Tue Aug 09, 2016 6:25 pm UTC
- Forum: Logic Puzzles
- Topic: Sharing secret information publicly
- Replies:
**27** - Views:
**6426**

### Re: Sharing secret information publicly

Take the sum modulo 7. This ensures that there are multiple hands for each answer, but with three cards you can still figure it out (since C's card has a potential variance of at most 6). For example, suppose A gives 5 as his answer. His hand could be 147, 156, 237, 246, or 345. The car...

- Mon Aug 08, 2016 6:43 pm UTC
- Forum: Logic Puzzles
- Topic: Sharing secret information publicly
- Replies:
**27** - Views:
**6426**

### Re: Sharing secret information publicly

You are on the right track, but as you stated, there are some situations, using your strategy, that leaches information to C. You need to come up with a system that does not allow C to learn anything irrespective of what A or B hold. Take the sum modulo 7. This ensures that there are multiple hands...

- Thu Aug 04, 2016 5:39 pm UTC
- Forum: Logic Puzzles
- Topic: Jenga
- Replies:
**15** - Views:
**9719**

### Re: Jenga

Version 1: Two players take turns removing blocks from the tower until it falls over. The tower will fall over if the middle block + either of the side blocks are removed. So valid positions for any given layer are |||, |X|, X||, ||X, X|X. This will hold even on the very top layer. Assuming both pl...

- Fri Jun 24, 2016 12:57 pm UTC
- Forum: Logic Puzzles
- Topic: Seeking Advise from Puzzle Masters
- Replies:
**20** - Views:
**5036**

### Re: Seeking Advise from Puzzle Masters

As for your first puzzle, it IS possible to solve, however there is an error. Clue #9 has A twice, indicating that repetition is allowed. However, making the assumption that it is not, it can be solved. I reached the same answer without making that assumption, and didn't even need two of the clues....

- Wed May 11, 2016 8:21 pm UTC
- Forum: Individual XKCD Comic Threads
- Topic: 1679: "Substitutions 3"
- Replies:
**29** - Views:
**7963**

### Re: 1679: "Substitutions 3"

Replacing "you won't believe" definitely makes some sites much more bearable. Now, are there any suggestions for what to replace "one weird trick" with?

- Fri Feb 05, 2016 6:01 pm UTC
- Forum: Logic Puzzles
- Topic: Six roll dice game
- Replies:
**11** - Views:
**3458**

### Re: Six roll dice game

After working backwards from the last roll, I came to the following answer: Stop if the first roll is atleast a 6, the second to fourth is a 5, or the fifth is a 4. Expected payout is 1709/324, or about $5.27. As for how much I would pay, $5. 1. I need some profit margin. 2. Although I like to combi...