Search found 76 matches

by Dashiva
Fri Apr 30, 2010 10:43 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0734: "Outbreak"
Replies: 126
Views: 25837

Re: "Outbreak" Discussion

This is so unscientific. If it's a toxin, and manufactured to boot, it won't be going away for good. Just wait a few weeks and some evil scientist will have (re)developed it and will be using it for evil. The proper response is to build a better isolation chamber and start studying the zombie. FOR S...
by Dashiva
Mon Mar 03, 2008 1:50 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0391: "Anti-Mindvirus"
Replies: 377
Views: 76220

Re: "Anti-Mindvirus" Discussion

Wow, this discussion veered about 180 from where I thought it would go. I knew the people who read this comic are obsessed with Randall, but I didnt think they would view him as some divine power able to supersede an infinite loop of rules. The way I see it, either you rejected the game from the st...
by Dashiva
Mon Feb 04, 2008 3:10 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0378: "Real Programmers"
Replies: 201
Views: 53837

Re: "Real Programmers" Discussion

I think the real moral here is that only the guy using nano actually gets work done. Everyone else is just standing around talking about butterflies.
by Dashiva
Wed Jan 02, 2008 11:27 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0365: "Slides"
Replies: 45
Views: 10986

Re: 'Slides' discussion that I am merging

I suspect the people who "bare with you" are also the people who go "here, here". It's like the words themselves have no meaning anymore, and they just repeat a sound they heard.
by Dashiva
Mon Mar 19, 2007 10:42 pm UTC
Forum: Logic Puzzles
Topic: 3 door problem
Replies: 88
Views: 27289

Cranking up the number of doors usually works for me when people need convincing.
by Dashiva
Wed Mar 14, 2007 11:36 am UTC
Forum: Logic Puzzles
Topic: Firing Squad Synchronization
Replies: 18
Views: 8077

The guru whispers to the general, "I see a prisoner with blue eyes", and then he knows it's time to start shooting. To generalize, information can only move one soldier per tick. The soldiers do not know how many they are. This seems to me to suggest that you need a counter (using states) ...
by Dashiva
Wed Mar 14, 2007 12:30 am UTC
Forum: Logic Puzzles
Topic: The surprise exam paradox
Replies: 217
Views: 61820

If it becomes Friday, the students go: A | B | C | D | E !A !B !C !D = E This is a valid deduction. On Thursday, it is shorter by one A | B | C | D | E !A !B !C = D | E The question is then if they are allowed to use their future knowledge (acquired on Friday) to conclude !E. Edit: I'm thinking some...
by Dashiva
Sun Mar 11, 2007 9:09 pm UTC
Forum: Logic Puzzles
Topic: Silly Prime Trivia
Replies: 16
Views: 5619

Pssh, it is easy to show that the 3rd smallest uninteresting number will always be uninteresting. * 1st smallest is smallest uninteresting, and is therefore interesting. * 2nd smallest is smallest uninteresting, and is therefore interesting. * 1st smallest ceases to be interesting since it's no long...
by Dashiva
Wed Mar 07, 2007 4:36 pm UTC
Forum: Logic Puzzles
Topic: Silly Prime Trivia
Replies: 16
Views: 5619

Factor 2 > not prime (even) Factor 3 > not prime (sum of digits) Factor 5 > not prime (5 or 0) Factor 11 > not prime (same digits) Square > not prime (rote memorization) This leaves us with factors 7 and 13, since we see that 7*17 = 119 is too big. The only possible number remaining is thus 7 * 13 ...
by Dashiva
Fri Mar 02, 2007 6:42 pm UTC
Forum: Logic Puzzles
Topic: Airplane On A Treadmill
Replies: 304
Views: 76160

If the treadmill matches the speed of the wheels, in the sense that the treadmill goes backwards with the speed that the wheels would be spinning if the airplane was on solid ground, then Vtreadmill = Vwheels (...) And replacing it into hte 1st equation we get Vtreadmill = Vtreadmill + C which is i...
by Dashiva
Wed Feb 28, 2007 1:25 am UTC
Forum: Logic Puzzles
Topic: Donuts Revisited [solution discussion]
Replies: 10
Views: 3810

The important observation is that if Bob is removed from the equation, you always win by picking a glazed donut.

Solution: Take a glazed donut, then pass by Bob's office and tell him they're out of donuts.
by Dashiva
Sat Feb 24, 2007 9:03 pm UTC
Forum: Logic Puzzles
Topic: LSK's arbitrary logic puzzle, round 2 (Thread has SOLUTIONS)
Replies: 7
Views: 4563

Statement 1 is not subject to true/false semantics. Statement 2 is a tautology. Finally, statement 3 is incomprehensible. Now, we know there are two types of robots. The basic ones that tell the truth, and the corrupted ones that may lie to advance their cause (destroying all humans), but otherwise ...
by Dashiva
Sat Feb 17, 2007 8:01 pm UTC
Forum: Logic Puzzles
Topic: You should be able to solve this!
Replies: 37
Views: 14244

Actually, the correct answer is to say "No, she can't solve it. You probably meant 19-x, didn't you teacher?" whereupon the teacher will act confused and otherwise as expected of a thwarted authority figure in a children's anime. The smart girl having confirmed her status and saved the stu...
by Dashiva
Sat Jan 20, 2007 1:49 am UTC
Forum: Logic Puzzles
Topic: The Pirate Proof [Solution Thread]
Replies: 5
Views: 3532

Didn't we already have this? It looks like http://forums.xkcd.com/viewtopic.php?t=330 with different constants. 1. x,x,x,x,1001 - Automatic pass 2. x,x,x,1001,0 - Automatic pass 3. x,x,1000,0,1 - 5th gets less in the next case, so he supports it. Passes 2 vs 1. 4. x,1000,0,1,0 - 4th gets less in the...
by Dashiva
Thu Jan 04, 2007 7:33 pm UTC
Forum: Forum Games
Topic: 3 letters in a word
Replies: 1795
Views: 250545

cwm

lpo
by Dashiva
Thu Jan 04, 2007 1:56 pm UTC
Forum: Forum Games
Topic: 3 letters in a word
Replies: 1795
Views: 250545

regurgitate

hyx
by Dashiva
Thu Jan 04, 2007 1:40 pm UTC
Forum: Logic Puzzles
Topic: #12: Remember Eeyore's Shack?
Replies: 6
Views: 3665

by Dashiva
Fri Dec 22, 2006 10:23 pm UTC
Forum: Logic Puzzles
Topic: Attacking queens
Replies: 7
Views: 3419

Queens cannot attack through other pieces, so in a line ABC, A and C do not threaten each other.
by Dashiva
Thu Dec 21, 2006 11:02 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0197: "Ninja Turtles"
Replies: 54
Views: 24265

Charlie Parker played bebop.
Charlie Parker played alto saxophone.
The music sounded like hip-hop.
Never leave your cat alone.

Something like that.
by Dashiva
Wed Dec 20, 2006 12:30 pm UTC
Forum: Logic Puzzles
Topic: The Narcoleptic Bookworm: Solution Thread
Replies: 14
Views: 5033

It looks like you forgot that page 1 is on the right side of the book when seen in a bookcase. I suppose you could be working with RTL books. :)
by Dashiva
Sat Dec 16, 2006 3:08 pm UTC
Forum: Logic Puzzles
Topic: The Man Who Shot Liberty Valance - [solutions]
Replies: 15
Views: 5624

Two main ways to obtain 4 in a container, by adding together two or by subtracting from one. Addition implies we already have 4 in the third container, so it is of no use. For subtraction, we have options 5-1, 6-2, 7-3, 8-4. 5-1 must pour into a 2/3 6-2 must pour into a 1/3 7-3 must pour into a 0/3 ...
by Dashiva
Sat Dec 16, 2006 1:10 pm UTC
Forum: Logic Puzzles
Topic: The Man Who Shot Liberty Valance - [solutions]
Replies: 15
Views: 5624

null - possible Since BC is possible, null is possible. A - possible 0 8 - 0 5 3 - 0 3 - 5 0 3 - 2 3 3 3 - 2 6 0 - 2 6 - 0 2 6 - 2 0 6 0 - 2 1 5 - 2 1 - 5 2 1 - 4 3 1 3 - 4 B - possible Since BC is possible, B is possible. C - possible Since BC is possible, C is possible. AB - impossible At some po...
by Dashiva
Sat Dec 16, 2006 12:45 pm UTC
Forum: Logic Puzzles
Topic: Choose a donut [solutions]
Replies: 4
Views: 3015

We can reduce the problem by limiting the population of co-workers to two, and then checking the possible combinations. More than two has no effect, as there are at most two donuts to be eaten. Less than two results in there always being donuts remaining. If both have a preference, you should take f...
by Dashiva
Thu Dec 14, 2006 12:15 pm UTC
Forum: Logic Puzzles
Topic: Seats on ANOTHER plane! [Solution Thread]
Replies: 8
Views: 3311

Ah, I notice what I missed. If several people are sitting in the first seat, that should skew the distribution on p(n-1) towards success, since lots of people are sitting in the first seat there. Cosmologicon's hypothesis looks good: p(2) = 3/4 = 3^1 / 2^2 p(3) = 16/27 = 4^2 / 3^3 p(4) = 125/256 = 5...
by Dashiva
Thu Dec 14, 2006 12:02 am UTC
Forum: Logic Puzzles
Topic: Seats on ANOTHER plane! [Solution Thread]
Replies: 8
Views: 3311

I arrived at the same result as Token posted in the problem thread: If there are more than x reservations among the x last seats, the seating fails. I also arrived at the same conclusion that the combinatorics were way too much work. :) Actually... Let p(n) be the chance of seating working out for n...
by Dashiva
Wed Dec 13, 2006 5:50 pm UTC
Forum: Logic Puzzles
Topic: Seats on a plane!
Replies: 13
Views: 4912

I did the same induction proof that's already been done several times, but I don't feel like just discarding all the text I wrote. :) We observe that the following two situations are identical: * A is going to sit down first, so he chooses randomly * A is going to sit down, but someone else has take...
by Dashiva
Mon Dec 11, 2006 12:50 pm UTC
Forum: Logic Puzzles
Topic: Lightbulbs in a circle [solution]
Replies: 5
Views: 3201

Lightbulbs in a circle [solution]

http://forums.xkcd.com/viewtopic.php?t=914 There are n lightbulbs in a circle. Each lightbulb can be either on or off. When a button is pushed, the lightbulbs will change as follows, once every second: if a lightbulb is in the same state (both off or both on) as its clockwise neighbor, it will be tu...
by Dashiva
Sun Dec 10, 2006 12:56 am UTC
Forum: Logic Puzzles
Topic: Envelopes puzzle
Replies: 10
Views: 5824

I thought we had done this one... There is x in envelope A. There is either 2x or x/2 in envelope B, giving expected value 1.25x. So we switch to B. We know there's either 2x or x/2 in envelope B and x in A. Let us call the value of B y. The expected value of A is then y/2 (A:x, B:2x) or 2y (A:x, B:...
by Dashiva
Fri Dec 08, 2006 7:47 am UTC
Forum: Logic Puzzles
Topic: The Vector Guessing Game [spoilers]
Replies: 10
Views: 4048

1. m = 2 for n = 2, trivially.

2. ???

3. Profit
by Dashiva
Wed Dec 06, 2006 4:13 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0193: "The Perfect Sound"
Replies: 47
Views: 17553

This is the true power of foreign-language music. You can enjoy songs with the most (insert negative adjective) lyrics possible only for their musical qualities, because nobody* has any clue what's being said.

* Nobody in your vicinity, assuming you pick the right language.
by Dashiva
Wed Dec 06, 2006 2:33 am UTC
Forum: Logic Puzzles
Topic: A Monkey and a Typewriter
Replies: 66
Views: 23022

You're using strings of different length. There should be an x option for abcdef as well in the first case. Point of interest: Any case of restarting the sequence completely is irrelevant to the question. Both sequences can restart at any point, and if one sequence is more likely after restarting th...
by Dashiva
Sun Dec 03, 2006 11:48 pm UTC
Forum: Logic Puzzles
Topic: Unfair beans
Replies: 7
Views: 3632

Alisto wrote:
n=3x-1. Any multiple of three, minus one. 2, 5, 8, 11, etc.

I'm not sure why yet. I'll figure it out and get back to you.



Intuitively, just play it like two simultaneous games of 0-2 and 3-5, mirroring the first moves on 3-5 to reduce it to 0-2. Similarily for higher triples.
by Dashiva
Sun Dec 03, 2006 11:21 am UTC
Forum: Logic Puzzles
Topic: 3 Spiders and a Fly [solution thread]
Replies: 15
Views: 6217

ulnevets wrote:fly rotates along with spiders, proves erasmus wrong
by Dashiva
Sat Dec 02, 2006 11:43 am UTC
Forum: Logic Puzzles
Topic: Snakes on a Plane solution thread (spoilers)
Replies: 29
Views: 8653

Buton wrote:Dashiva, what is S in your equations? I can't figure out what it is...


S was supposed to be the number of snakes, but I was using a formula that didn't quite fit the problem. So the result wasn't quite right.
by Dashiva
Sat Dec 02, 2006 11:37 am UTC
Forum: Logic Puzzles
Topic: Temperatures
Replies: 60
Views: 13058

I'd like to say that ostriches aren't birds. I really would. However, flight is not a defining characteristic: feathers, external reproduction... and... um... well, those two are. With the numerical scales, having infinity, 0, and -infinity are defining/required characteristics. So the natural numb...
by Dashiva
Fri Dec 01, 2006 5:13 pm UTC
Forum: Logic Puzzles
Topic: Snakes on a Plane solution thread (spoilers)
Replies: 29
Views: 8653

Close, but your comma snake is not touched by a snout. Maybe he's afraid they'll bite him! Who are you to judge the poor snake and his irrational fears? Second run: Without loss of generality, we can assume snake A touches snake B head-middle, snake C middle-tail and snake D tail-head. Snake B's ta...
by Dashiva
Fri Dec 01, 2006 4:00 pm UTC
Forum: Logic Puzzles
Topic: Things that don't amount to short enough titles [SOLUTION]
Replies: 25
Views: 9395

The problem thread is Things that don't amount to more than a hill of beans, a title which is too long for attaching [solution]. :idea:
by Dashiva
Fri Dec 01, 2006 9:55 am UTC
Forum: Logic Puzzles
Topic: Snakes on a Plane solution thread (spoilers)
Replies: 29
Views: 8653

There has to be at least four snakes so each snake can touch three others. Ignoring this requirement, it can be done with two. (There has to be an even number of snakes for the number of touch points to be even.) .................>\*/ . * . * x>,,,,,,,,x,,,,,,,>x . \+/ * . + * /.\<+++++++x<********
by Dashiva
Thu Nov 30, 2006 12:03 am UTC
Forum: Logic Puzzles
Topic: A Very Large Graph
Replies: 14
Views: 5610

You talk about what happens in the limit, but the limits seem to show the opposite. Suppose you add 3 vertices the first turn and 2 the following turns. The number of vertices minus one is then 2n. The number of edges is n. If the graph is connected, the ratio edges / (vertices minus one) must be gr...
by Dashiva
Wed Nov 29, 2006 9:40 pm UTC
Forum: Logic Puzzles
Topic: A Very Large Graph
Replies: 14
Views: 5610

This seems exceedingly trivial, so there's probably a missing detail. #1 draws 3 vertices the first turn, then 1 vertex every other turn. After n turns, he will have drawn n+2 vertices. #2 will have drawn n edges, but n+1 edges are required to connect the graph. 3 and 1 are both finite numbers, and ...

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