Einstein's Logic Puzzle

[Neoma]

It's purported that Einstein said 98% of the world's population could not figure out this logic problem. http://www.brain-fun.com/Brain-Teasers/EinsteinsRiddle.php

There are 5 houses each with a different color. Their owners, each with a unique heritage, drinks a certain type of beverage, smokes a certain brand of cigarette, and keep a certain variety of pet. None of the owners have the same pet, smoke the same brand of cigarette or drink the same beverage.

Clues:

* The Brit lives in the red house.
* The Swede keeps dogs as pets.
* The Dane drinks tea.
* The green house is just to the left of the white house.
* The green house's owner drinks coffee.
* The person who smokes Pall Malls raises birds.
* The owner of the yellow house smokes Dunhill.
* The man living in the center house drinks milk.
* The Norwegian lives in the first house.
* The man who smokes Blends lives next to the one who keeps cats.
* The man who keeps a horse lives next to the man who smokes Dunhill.
* The owner who smokes Bluemasters also drinks beer.
* The German smokes Prince.
* The Norwegian lives next to the blue house.
* The man who smokes Blends has a neighbor who drinks water.

Who owns the fish?


By the way, I solved it. :evilgrin:

[Ptah]

1. ooh ooh I know, I know

:bluebox: you take the chicken over
:bluebox: go back
:bluebox: take the food over
:bluebox: put the food down on the bank
:bluebox: take the chicken back across
:bluebox: put the chicken down again on the bank
:bluebox: take the fox over
:bluebox: go back
:bluebox: take the chicken across

[Neoma]

2. Huh?

You make no sense!

[Dr. Strange]

5. That's a good puzzle too.

Sadly the answer there doesn't transfer over to other puzzles...

[LibraLiz1973]

3. Wait- I have a piece of paper out trying to make the grid

I'll post when I think I have the answer?

[LibraLiz1973]

4. I have some fucked up grid here but haven't closed in on the answer as yet

I refuse to look at the spoiler

[LibraLiz1973]

6. I quit!! lol - How did you figure that out???

I looked at the answer. I'd guessed it was the guy in the green house but not because of logic- only because the word green was used in 2 sentences back to back. Lame, I know.

[Neoma]

7. You're not supposed to guess.

You're supposed to make a grid.

[LibraLiz1973]

8. Sadly I just tried to do the cigarette one

And had to make a grid there as well.

I'm not good at logic puzzles- never have been.
Don't know why? ANNOYING!!

[jpgray]

9. Make a few charts, plot out what you know, and go from there! It's easy enough.

Knowing the way to attack it is really the only issue, which is something anyone of average intelligence can learn.

[rug]

10. Who's the asshole in the white house?

[Neoma]

11. Having fun?

[rug]

12. I'm getting there.

[Neoma]

13. I'm timing you!

Just kidding.

[pokerfan]

14. I remember seeing that one some time back

It was more tedious than difficult. I just made a grid and used lines to connect the objects/people next door to each other.

Here's one of my favorites:

Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, say No. 1, and the host, who knows what's behind the doors, opens another door, say No. 3, which has a goat. He then says to you, "Do you want to pick door No. 2?"

Should you switch?
Should you stay?
Doesn't matter?

[Neoma]

15. I'm tired for today.

I might get back to that one.

[MonkeyFunk]

16. Ah, the famous Monty Hall question

The answer is you should switch. It caused all sorts of uproar when Marilyn Vos Savant published it.

[Lethe]

17. YES ALWAYS SWITCH!

i got asked the monty hall question on the spot at a high pressure interview once.....

the guy just stared at me the whole time while i was trying to figure it out.....talk about stress!

[pokerfan]

21. Pretty unfair to spring such a counter-intuitive puzzle

on an interviewee. For one thing, some people are just puzzle fans and would know the answer from memory.

I've seen many smart people get it wrong so I doubt that I would use in an interview process except maybe to evaluate how well they could communicate the answer verbally. Assuming such attributes were a job requirement.

But then I like to spring the old cube if resistors puzzle on EE candidates. I just like to see how they approach such a problem.

[Lethe]

24. sorry bout the all caps lol, it brings back memories!

yeah, this guy was just seeing how i solved problems....but i'm not very good at doing stuff when a guy is staring over my shoulder....

i'm not a wiz with probability, so what i did was just write out every single possible outcome of the game, and then looked and saw what had the best outcome for the choices.

For me, this is still the easiest way to explain the answer. If you show someone a table of all the outcomes, they will see it.

[pokerfan]

18. Yeah

She even got hate mail from mathematicians.

[qwertyMike]

19. Stay

But i forget the math logic.
Could you point me to it?

[Lethe]

20. no u gotta switch

it's not 50/50

i believe it's 2/3 chance to win if you switch, 1/3 if you stick

[pokerfan]

22. Yep, same odds you had of guessing the right door

before the goat was revealed. Since the host can always reveal a goat since he knows what's behind each door, the reveal changes nothing.

You are still left holding a door that had a 1/3 probability of winning.

Therefore you should switch.

[MonkeyFunk]

23. correct

"The chance of initially choosing the car is one in three, which is the chance of winning the car by sticking with this choice. By contrast, the chance of initially choosing a door with a goat is two in three, and a player originally choosing a door with a goat wins by switching. In both cases the host must reveal a goat. In the 2/3 case where the player initially chooses a goat, the host must reveal the other goat making the only remaining door the one with the car."

http://en.wikipedia.org/wiki/Monty_Hall_problem#Solution

[Inchworm]

25. Gonna answer then look

It was fun as hell with a good beer buzz and a love high.

The Prince smokin, coffee drinkin, German that lives in the green house has the fish.

:hi:

[Jamastiene]

26. The German n/t

From left to right:

Norwegian
Yellow
Water
Dunhill
Cats

Dane
Blue
Tea
Blends
Horse

Brit
Red
Milk
Pall Malls
Birds

German
Green
Coffee
Prince
Goldfish

Swede
White
Beer
Bluemasters
Dogs

[Neoma]

27. Let other people solve it too!

:(

[Inchworm]

28. I woke up to see if I was right

Good thing I read down thread.

I win! .. ok.. I shall take my drunk ass back to bed...

:boring:

[Jamastiene]

29. ...

Oh, sorry.
I thought it had been solved already and it was ok to post it. Oops.

I did it with a table in a document file. Sorry if I spoiled it.

[PVnRT]

30. The house is at the North Pole

Oops, wrong one.

[alphafemale]

31. kicking for later

[Q3JR4]

32. I've solved it before too,

but I seem to recall that Einstein really had nothing to do with it. I don't know though.

:shrug:

[Neoma]

33. Huh.

Still fun.