Search found 38 matches

by bobleboffon3
Thu Sep 06, 2018 2:15 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 2042: "Rolle's Theorem"
Replies: 86
Views: 13933

Re: 2042: "Rolle's Theorem"

Am I a clueless art person if I look at the "Orange, Red, Yellow" painting and genuinely believe my kid could make that?
by bobleboffon3
Mon Jan 29, 2018 11:02 pm UTC
Forum: Logic Puzzles
Topic: The Goddess, the Villagers, and the Traveler
Replies: 16
Views: 8015

Re: The Goddess, the Villagers, and the Traveler

Now all the villagers believe that X is the goddess. If X is in fact the goddess, I've met the victory condition. If not, everyone sits there in confusion wondering why she hasn't revealed herself. I realise I've chosen wrong, and tell all the villagers “Forget everything that happened since the be...
by bobleboffon3
Tue Apr 02, 2013 1:55 pm UTC
Forum: News & Articles
Topic: Do You Care About Privacy? You're Lying.
Replies: 23
Views: 3771

Re: Do You Care About Privacy? You're Lying.

Consumers insist that they treasure their online privacy. But their mouse clicks tell a far different tale, as the experiments of a behavioral economist show. I... think he's really jumping to false conclusions. Sometime we don't even have a choice. His 'experiment', to me, looks just like someone ...
by bobleboffon3
Sat Feb 02, 2013 1:53 am UTC
Forum: Logic Puzzles
Topic: The truthteller and the politician
Replies: 65
Views: 25956

Re: The truthteller and the politician

the only method to improve accuracy, threaten them, unless your knowledge is worth more than they are eventually one of them will change thier mind revealing who it is. I don't think this would work. Imagine that it works, and the truth teller tells you that he doesn't want to be threatened, and te...
by bobleboffon3
Thu Jan 31, 2013 6:54 am UTC
Forum: Logic Puzzles
Topic: The truthteller and the politician
Replies: 65
Views: 25956

Re: The truthteller and the politician

The politician just have to 'act' like the truthteller would act if the roads were the other way around. I think it's bulletproof.. there's nothing that would tell them apart. If the truthteller says yes/no to a random question, the politician says yes/no to that question. If the truthteller says ye...
by bobleboffon3
Fri Nov 04, 2011 1:12 am UTC
Forum: Logic Puzzles
Topic: 3 cups 1 ball logic problem
Replies: 6
Views: 3829

Re: 3 cups 1 ball logic problem

As previous posters said, it's 1/2, not 2/3. It's obvious to see the problem occuring if it was 2/3 : You'd be 2/3 to get the right cup if you took cup B, but also if you took cup C, which obviously makes no sense. In probability/statistic, you should always try to figure out if your solution make s...
by bobleboffon3
Fri Sep 16, 2011 8:26 am UTC
Forum: Logic Puzzles
Topic: Three Guns
Replies: 12
Views: 3582

Re: Three Guns

Case 1: you choose your guns before the shooting order has been decided.Since all 6 shooting orders are equally likely, your odds of winning are just the average of the odds for your gun to win in each of the six possible shooting orders. These come out to: 184/432 for Gun 1 93/432 for Gun 1/2 155/...
by bobleboffon3
Wed Aug 17, 2011 3:47 pm UTC
Forum: Logic Puzzles
Topic: Puzzle for anyone except for eve [SOLUTION]
Replies: 58
Views: 20801

Re: Puzzle for anyone except for eve [SOLUTION]

Bob will never get to open the box. Assuming they're all perfect logicians. It was already demonstrated that, if Bob and Alice play it smart, Eve will never open the box. Eve can figure that out tho. So she has 2 options : -Steal everything. Result : Nobody gets to open the box. -Do anything else Re...
by bobleboffon3
Sat May 07, 2011 4:27 pm UTC
Forum: Logic Puzzles
Topic: The Case of the Missing Dollar
Replies: 44
Views: 16387

Re: The Case of the Missing Dollar

People who don't get it instantly rarely understand it even if you explain it "the logical way". Even if you tell them you have to count it differently, they'll just wonder why if you count it this way it will not work. Like most similar problems, tho, you can show them why it doesn't make...
by bobleboffon3
Fri Feb 18, 2011 2:21 pm UTC
Forum: Logic Puzzles
Topic: Infinite Balls and Jugs [solution]
Replies: 611
Views: 113978

Re: Infinite Balls and Jugs [solution]

The "0 balls left in the jug" solution makes no sense to me... Yes, at some point all balls ( individually ) will be removed, but it'll never be empty. The argument seems to be "The chance of a given balls never to be removed is 0, so the jar will be empty". The first part of the...
by bobleboffon3
Fri Feb 11, 2011 1:59 pm UTC
Forum: Logic Puzzles
Topic: The surprise exam paradox
Replies: 217
Views: 65091

Re: The surprise exam paradox

Thursday comes, and the student know it can't be on friday, so he declares : I know the exam is gonna be today. The teacher then says : Ok, are you willing to bet your life on it? If the exam is today, I give you a 100% mark. If the exam is not today, I shoot you to death. The student will never ac...
by bobleboffon3
Sat Feb 05, 2011 4:51 am UTC
Forum: Logic Puzzles
Topic: Twins in a Maze
Replies: 81
Views: 21335

Re: Twins in a Maze

The way I see it, for the twins not to be able to meet up somewhere, 3 conditions need to be there. 1) The maze must have rotational symmetry 2) The twins must have no way to differenciate each other/talk beforehand 3) The twins must have no way to figure out a random number/event If an...
by bobleboffon3
Fri Jan 28, 2011 5:23 am UTC
Forum: Logic Puzzles
Topic: The surprise exam paradox
Replies: 217
Views: 65091

Re: The surprise exam paradox

Does this exchange fairly capture the student's argument? If not, why not? Going backwards in time like this, it seems the student's argument is completely logical and completely reasonable. But what happens if we start from the very beginning? First of all, I'll say that I don't really like the wo...
by bobleboffon3
Thu Jan 13, 2011 4:59 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0846: "Dental Nerve"
Replies: 135
Views: 35791

Re: 0846: "Dental Nerve"

It's days like this that I wish Weird Al had a female counterpart. I'd love a full-length parody of that song. I know there are ones on YouTube, but they're probably all the usual junk that Internet kids with cheap microphones, pirated karaoke albums, and no real talent think are hilarious. This on...
by bobleboffon3
Wed Oct 20, 2010 7:35 am UTC
Forum: Logic Puzzles
Topic: Poker hands
Replies: 26
Views: 4181

Re: Poker hands

Did you word that correctly? 0% chance of winning is the same as 100% chance of losing?
Or in which option ( winning/losing ) do you place the split pots?
by bobleboffon3
Sun Sep 26, 2010 9:10 am UTC
Forum: Logic Puzzles
Topic: Straw power
Replies: 42
Views: 8604

Re: Straw power

I don't think it's realist at all to talk about a solution like blowing the sandbag ( with or without the straw ). You don't really even need to talk about air friction. You'd die, exhausted, way before the sandbag is even close to the bottle. I think the fact the puzzle mention a 300KG sandbag coun...
by bobleboffon3
Tue Jul 27, 2010 8:47 am UTC
Forum: Logic Puzzles
Topic: Cat and mouse
Replies: 29
Views: 13435

Re: Cat and mouse

jaap's answer looks good. I think any answer with repetitive sequence will work as long as the sequence will mix the odd/even attempt. i.e. you try "2" on an even try, then on a odd try. It's easy to proove the 2-3-4 method works. Let's call the moves 1st, 2nd, and 3rd. (f...
by bobleboffon3
Sun Jul 25, 2010 3:36 pm UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

Sure, here's one. I don't know what's the english word for this.. In french it's an "Avantage", I assume in english it's an advantage, or an edge? Anyway, it's when a side ( presumably much better than the other side ) decide to start the game with less pieces/pawns than the other side. As...
by bobleboffon3
Sun Jul 25, 2010 10:53 am UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

Damn, I have to get used to that rule already heh. If the white can't castle, the game is going to a stalemate as soon as the king capture the rook. But the black don't have the choice to capture it : There's no other legal move to do. So as soon as the white move their rook in e3, it&#...
by bobleboffon3
Sun Jul 25, 2010 8:14 am UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

Still trying to figure out how to proove whites can castle. Trying to go back in moves, but I can't see how that will help. There is obviously a lot of moves to get to that position, and I don't know how we'll be able to proove nowhere in those moves did the white move their king or roo...
by bobleboffon3
Sat Jul 24, 2010 1:05 pm UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

I'm not sure to get the "rh8" thing... but anyway, take a look at these, and tell me what's wrong. White having the last move (Put a black rook in h1 and the white king in c5) 1 Kc6 ... Rh6+ 2 Kc5 ... Rc6+ 3 Kxc6 Black having the last move (Put a white rook in h1 and t...
by bobleboffon3
Sat Jul 24, 2010 11:52 am UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

I believe I can still create this situation for either side... Last move is obviously a capture, with the king, either white, or black. Say it's the black king, and it came from h7. The board is symmetric, so the g8 case is handled(except for pawn promotion). Last white move, blunder: R...
by bobleboffon3
Sat Jul 24, 2010 10:54 am UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

Hem.
Is there a catch? Or did you forgot to add some pieces to the board?

We can get to this position easily with any side making the last move!
by bobleboffon3
Sat Jul 24, 2010 8:07 am UTC
Forum: Logic Puzzles
Topic: Three princesses
Replies: 446
Views: 202793

Re: Three princesses

why is evryone makin this puzzle so complex?? Because your "not so complex" answer doesn't work! If you ask the oldest sister if the middle sister is the most honest of the three, she'll answer "no", which mean, in your solution, you're gonna pick her ( the middl...
by bobleboffon3
Sat Jul 24, 2010 4:08 am UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

Image

During the last 5 moves, no pawn was moved, and no capture happened.
Where is the black king?
by bobleboffon3
Sat Jul 24, 2010 3:45 am UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

(Edit, your answer is correct. Forgot I posted a problem too) Had to use your hints, couldn't find anything :x 1 e2-e4 ... Nf6 2 f2-f3 ... f6xe4 3 Qe2 ... Ng3 4 Qe7+ ... Qxe7+ 5 Kf2 ... Nxh1++ When I found this, I reread my whole "proof" to find out where I was wrong... My mistake was that...
by bobleboffon3
Fri Jul 23, 2010 7:03 am UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

I'd rather try to finish my proof/reasonning thing before looking at the hints. But so far, I'm clueless, so maybe I'll use them soon :| But well, while I'm thinking about this, here's one for you : http://img37.imageshack.us/img37/8932/chessi.jpg It's not a very hard problem. The question is : on w...
by bobleboffon3
Fri Jul 23, 2010 1:36 am UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

It looks very hard. I can find a lot of checkmate in 6 moves, but not in 5. No solution yet, but here's my thought process so far : It takes 4 moves for a black knight to get to either rook. Which leaves only 1 move to bring another piece. The other knight can't get close enough to do anything u...
by bobleboffon3
Wed Jul 21, 2010 9:00 am UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

^That solution is correct.

I could post a few more of those, if anyone knew about some website where I could place the chess pieces on the board to get the image of the problems?

Feel free to post more of them if you got more, too! :)
by bobleboffon3
Tue Jul 20, 2010 8:23 am UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

Well done, that's correct. Would you like to post a puzzle Sure, here's a very good one in my opinion. Very elegant problem. http://img843.imageshack.us/img843/9097/chess.jpg The image isn't very clear, I think they scanned it out of the book, but well. For the record, h8 is the white king, b7 is t...
by bobleboffon3
Mon Jul 19, 2010 8:12 am UTC
Forum: Logic Puzzles
Topic: Chess problem: The missing king
Replies: 60
Views: 11115

Re: Chess problem: The missing king

I love retrograde analysis! I've read one of Smullyan's book about this ( along with 3-4 of his other books ), so this is an easy problem, but it's still fun :) Black knight is checkmate by the bishop. But the bishop obviously can't be the last piece moved by the white... Any case it could'v...
by bobleboffon3
Fri Jul 16, 2010 10:57 pm UTC
Forum: Logic Puzzles
Topic: Angels and Demons
Replies: 55
Views: 14313

Re: Angels and Demons

Incidentally, I'd be curious to hear what you think of my earlier solution to the puzzle: asking either character, "if I ask your companion there whether he is an angel, will he say yes?" Well the only problem I see with this solution, is that nowhere in the problem ( unless I mis...
by bobleboffon3
Fri Jul 16, 2010 6:16 pm UTC
Forum: Logic Puzzles
Topic: Angels and Demons
Replies: 55
Views: 14313

Re: Angels and Demons

So if I said that I am either the pope or am lying, would you say I am telling the truth or lying? I think you should say that I am doing neither -- I'm speaking gibberish. If we assume that both the angel and the demon can only tell the truth or lie (and not speak gibberish, or use any oth...
by bobleboffon3
Fri Jul 16, 2010 8:36 am UTC
Forum: Logic Puzzles
Topic: Three princesses
Replies: 446
Views: 202793

Re: Three princesses

Good use of logic and it works, but now try for the situation where the middle sister could just ignore your question and answer however she likes; that is, she might just say 'Yes' anyway because she's like that , and damn the consistency. There is a nice, elegant answer. I actually thought about ...
by bobleboffon3
Fri Jul 16, 2010 8:21 am UTC
Forum: Logic Puzzles
Topic: How to confirm if someone is your "future you"?
Replies: 96
Views: 14662

Re: How to confirm if someone is your "future you"?

This one could be easily answered by using our own situation... I mean, I can think of a billion things that no one but me knows. Girls I loved but kept it for myself... Evil things I did as a kid and never told anyone, never got caught... There's a lot of things that are really important to yo...
by bobleboffon3
Fri Jul 16, 2010 8:08 am UTC
Forum: Logic Puzzles
Topic: Pinocchio Paradox
Replies: 42
Views: 18404

Re: Pinocchio Paradox

The answer to this question/paradox is as simple as it is unfunny. Pinocchio's nose is supposed to grow when Pinocchio's tells lies. This puzzle brings a situation where if pinocchio's nose grow, he told the truth ( so his nose shouldn't have grown ) and if his nose don'...
by bobleboffon3
Fri Jul 16, 2010 8:00 am UTC
Forum: Logic Puzzles
Topic: Angels and Demons
Replies: 55
Views: 14313

Re: Angels and Demons

You can find out if he's a demon easily with a simple question (2 part question) : Are you an angel or are you lying to this question? If he's an angel, he tells the truth, and the first part is "yes", second part is "no". Yes or no = yes. An angel would anwser &...
by bobleboffon3
Fri Jul 16, 2010 7:48 am UTC
Forum: Logic Puzzles
Topic: Three princesses
Replies: 446
Views: 202793

Re: Three princesses

Hey all, this is my first post, I didn't even knew there was a logic puzzles forum on XKCD, else I would've come much earlier! I wanted to find my own answer to this riddle before looking at the "real" answer. Mine is a bit more complicated I guess, it's the only pure logic an...

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