The Daily Riddle Thread

149 posts / 0 new
Last post
raccoon city
raccoon city's picture
Offline
Last seen: 17 min 33 sec ago
Joined: 10/06/2010 - 02:35
Posts: 17281
Location: रॅकून सिटी Palm Desert CA USA

fellfromtree wrote:
Sure you guys would know this one but I’ll change it around a bit Tongue

This fat guy bumps into this circus clown. There’s 3 walnut shells on a table and he shows a bead under one. He tells the guy if he can pick the one with the bead after the shuffle he gets $100. The kicker is he shuffles them behind a cardboard box so the fat guy can’t see. After the shuffle the clown knows where the bead is. The fat guy then picks one of the 3 shells.

The clown, knowing which of the 3 has the bead under it, takes one of the empty shells off the table and offers the fat guy to switch his choice between the 2 that are left, or stay with what he’s already picked.

Should he switch or does it matter? Big smile

According to MythBusters, he should switch.   Wink

DavidEF
DavidEF's picture
Offline
Last seen: 3 days 22 hours ago
Joined: 06/05/2014 - 06:00
Posts: 7699
Location: Salisbury, North Carolina, USA

raccoon city wrote:

fellfromtree wrote:
Sure you guys would know this one but I’ll change it around a bit Tongue

This fat guy bumps into this circus clown. There’s 3 walnut shells on a table and he shows a bead under one. He tells the guy if he can pick the one with the bead after the shuffle he gets $100. The kicker is he shuffles them behind a cardboard box so the fat guy can’t see. After the shuffle the clown knows where the bead is. The fat guy then picks one of the 3 shells.

The clown, knowing which of the 3 has the bead under it, takes one of the empty shells off the table and offers the fat guy to switch his choice between the 2 that are left, or stay with what he’s already picked.

Should he switch or does it matter? Big smile

According to MythBusters, he should switch.   Wink


Depends on how well he trusts the clown. I think the clown has the bead elsewhere. J)

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

fellfromtree
fellfromtree's picture
Offline
Last seen: 7 years 2 weeks ago
Joined: 07/25/2014 - 15:14
Posts: 470
Location: spelunking

Heheh maybe he wants the bead as a consolation prize. Yeah raccoon I didn’t even see that on Mythbusters. When first heard of it I couldn’t believe it myself, but that lady with the high iq explained it well.

He picks, and his chances are 33.3%. But if you were to make it 100 shells, his chances are 1%. She went on to say 100 or 3 shells it’s still the same idea. If he takes away 98 empty shells your better off switching, just as if he takes away 1 out of 3. Smile Really interesting stuff cause you wouldn’t believe it unless they ran a computer simulation to prove it’s true.

edit
Aye.. I got thinking about it though. That’s right the only way to get true 50/50 odds is to switch. The odds become 50/50 after the shell is taken away, but not for you until you switch shells.. Man I always thought it was one of those things that is what it is lol

All running late too.. catch you guys later

Boaz
Boaz's picture
Offline
Last seen: 12 hours 50 min ago
Joined: 11/07/2010 - 09:31
Posts: 7720
Location: Birthplace of Aviation

Easier way to understand it is to have 100 shells and the person picks one shell ...1 out of 100

 then the clown takes away 94 shells and offers you another pick ..should you take it ?

easy answer is yes 

which do you like better your 1 out of a hundred chance or one out of 5 ?

 

 

  don't trust clowns 

       καὶ τὸ φῶς ἐν τῇ σκοτίᾳ φαίνει καὶ ἡ σκοτία αὐτὸ οὐ κατέλαβεν

                            

       Dc-fix diffuser film  >…  http://budgetlightforum.com/node/42208

VFMaddict
Offline
Last seen: 1 year 9 months ago
Joined: 06/03/2011 - 08:47
Posts: 1454
Location: London

The clown and shell riddle reminded me of another classic.

A clever man in ancient times was due to be tried for murder. He was given the opportunity to be tried by ‘Chance’. There would be 50 black beads and 50 white beads placed in a bowl. He would then be blindfolded and asked to pick. If the bead was white he would live. If it was black he would die.

He asked the court if he could distribute the beads into two bowls. He would then be blindfolded and the bowls shuffled around. He would then have to pick a bowl, without touching it, reach in and take a bead from it. There would still be 50 black beads and 50 white beads in total and he would still be blindfolded. The court decided they would grant his wish as they could not see how it would make any difference.

This clever man was delighted. He managed to increase his chances of survival to almost 75%. How did he do it?

BTW this is supposed to be a true story from ancient texts and in the original this guy was still very unlucky because despite shifting the odds very heavily in his favor he still ended up picking a black bead.

"You are making progress if each mistake you make is a new one."

Remember - Most great discoveries start with maki

DavidEF
DavidEF's picture
Offline
Last seen: 3 days 22 hours ago
Joined: 06/05/2014 - 06:00
Posts: 7699
Location: Salisbury, North Carolina, USA

VFMaddict wrote:
The clown and shell riddle reminded me of another classic.

A clever man in ancient times was due to be tried for murder. He was given the opportunity to be tried by ‘Chance’. There would be 50 black beads and 50 white beads placed in a bowl. He would then be blindfolded and asked to pick. If the bead was white he would live. If it was black he would die.

He asked the court if he could distribute the beads into two bowls. He would then be blindfolded and the bowls shuffled around. He would then have to pick a bowl, without touching it, reach in and take a bead from it. There would still be 50 black beads and 50 white beads in total and he would still be blindfolded. The court decided they would grant his wish as they could not see how it would make any difference.

This clever man was delighted. He managed to increase his chances of survival to almost 75%. How did he do it?

BTW this is supposed to be a true story from ancient texts and in the original this guy was still very unlucky because despite shifting the odds very heavily in his favor he still ended up picking a black bead.


Well, it sounds good, but upon analysis, he still really had a 50% chance of losing. The idea, I guess, is that he had a 50% chance of a 50% chance of picking a black bead, for a total of 25% probability. The problem with this logic is that he also had a 50% chance of a 50% chance of picking a white bead, which means that he had equal probability either way. The only way he could increase his odds of living would be to pick twice. Of course, even a 50% probability of living, strictly by chance, in a murder trial, is already quite generous.

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

VFMaddict
Offline
Last seen: 1 year 9 months ago
Joined: 06/03/2011 - 08:47
Posts: 1454
Location: London

???? I’m not sure what you are saying it was that he did?

"You are making progress if each mistake you make is a new one."

Remember - Most great discoveries start with maki

Boaz
Boaz's picture
Offline
Last seen: 12 hours 50 min ago
Joined: 11/07/2010 - 09:31
Posts: 7720
Location: Birthplace of Aviation

He puts one white ball in the one bowl 

and 99 mixed up balls in the other 

giving him a slightly less than  50/50 chance in the mixed bowl 

and a 100% chance in the bowl with one white ball 

  74+ % chance of being white 

 

 

don't trust murderers

       καὶ τὸ φῶς ἐν τῇ σκοτίᾳ φαίνει καὶ ἡ σκοτία αὐτὸ οὐ κατέλαβεν

                            

       Dc-fix diffuser film  >…  http://budgetlightforum.com/node/42208

DavidEF
DavidEF's picture
Offline
Last seen: 3 days 22 hours ago
Joined: 06/05/2014 - 06:00
Posts: 7699
Location: Salisbury, North Carolina, USA

VFMaddict wrote:
???? I’m not sure what you are saying it was that he did?

I don’t know if you’re directing this to me, or not. Here is what I’m saying. The man had asked for the beads to be divided into two bowls. The riddle didn’t specify how the beads were divided, but there are two ways that would make sense.

1) Equal amounts of both black and white beads in each bowl.
2) One bowl with all black beads and the other with all white beads.

If the idea was to increase the chance of survival, dividing into an all-black-beads bowl and all-white-beads bowl would not have helped because his “choosing” action would still yield exactly 50% statistical chance of picking the right bowl, then 100% chance of getting whichever color was in that bowl.

So, that leaves the method of dividing black and white beads evenly into two bowls. Going by the earlier comparison to the other bead riddle, I assumed this is what was meant. And looking at the supposed statistical benefit of changing one’s choice after a known bad choice is removed from the equation, it would seem the same benefit could be gained here. The idea is that he is now choosing twice – once for the bowl, and again for the bead, but not so. The choice of which bowl to pick from will statistically yield 100% chance of getting an equal amount of each color of beads, so it is effectively a non-change. Then, you are still left with a 50% chance of getting the right (or wrong) color of bead from whichever bowl you pick from.

Thinking even further into it, the man may have actually decreased his luck by dividing the beads. Even though in pure statistical chance, his odds are the same, in reality, he had fewer beads to draw from. If you think of polls that are done, or any sampling that is performed, the desire is always to have a larger percentage of the whole to be sampled. And, the larger your sample, the more accurate your results are considered to be. Same thing with star ratings of products we buy online. If five people out of five say the product is good, do you trust that? What about 9995 out of 10,000? Even though 5 out of 5 is a “better” rating, it is less reliable because you know there are billions of people in the world and a lot of them may just be not buying it because they already “know” it’s not worth having. So, back to the beads in the bowls. The guy could have had twice as many opportunities to grab a white bead. Although statistically he would have still had an equal chance at getting a black bead, in reality he may have fared better had he kept them all!

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

DavidEF
DavidEF's picture
Offline
Last seen: 3 days 22 hours ago
Joined: 06/05/2014 - 06:00
Posts: 7699
Location: Salisbury, North Carolina, USA

Boaz wrote:

He puts one white ball in the one bowl 

and 99 mixed up balls in the other 

giving him a slightly less than  50/50 chance in the mixed bowl 

and a 100% chance in the bowl with one white ball 

 total being like 74% chance of being white 

 

 

don’t trust murderers


Hmmm… didn’t think of that one.

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

Legolas Jr.
Legolas Jr.'s picture
Offline
Last seen: 6 days 19 hours ago
Joined: 09/17/2013 - 21:55
Posts: 883
Location: Springport, IN

Boaz wrote:

He puts one white ball in the one bowl 

and 99 mixed up balls in the other 

giving him a slightly less than  50/50 chance in the mixed bowl 

and a 100% chance in the bowl with one white ball 

  74+ % chance of being white 

 

 

don’t trust murderers


Clever!

“Strive to be a warrior and a scholar. Be forged in fire and tempered by knowledge. If not, you will either lack the courage to fight for your ideals or lack ideals worth fighting for.”

Legolas Jr.
Legolas Jr.'s picture
Offline
Last seen: 6 days 19 hours ago
Joined: 09/17/2013 - 21:55
Posts: 883
Location: Springport, IN

Throw away the outside and cook the inside, then eat the outside and throw away the inside. What is it?

“Strive to be a warrior and a scholar. Be forged in fire and tempered by knowledge. If not, you will either lack the courage to fight for your ideals or lack ideals worth fighting for.”

agarb
Offline
Last seen: 6 months 3 weeks ago
Joined: 03/23/2013 - 19:24
Posts: 64
Location: USA

sweet corn

Legolas Jr.
Legolas Jr.'s picture
Offline
Last seen: 6 days 19 hours ago
Joined: 09/17/2013 - 21:55
Posts: 883
Location: Springport, IN

agarb wrote:
sweet corn

Yep!

“Strive to be a warrior and a scholar. Be forged in fire and tempered by knowledge. If not, you will either lack the courage to fight for your ideals or lack ideals worth fighting for.”

Legolas Jr.
Legolas Jr.'s picture
Offline
Last seen: 6 days 19 hours ago
Joined: 09/17/2013 - 21:55
Posts: 883
Location: Springport, IN

Eskimos are excellent hunters, but they never hunt penguins. Why not?

“Strive to be a warrior and a scholar. Be forged in fire and tempered by knowledge. If not, you will either lack the courage to fight for your ideals or lack ideals worth fighting for.”

VFMaddict
Offline
Last seen: 1 year 9 months ago
Joined: 06/03/2011 - 08:47
Posts: 1454
Location: London

For the same reason that Polar Bears don’t…………… Wink

"You are making progress if each mistake you make is a new one."

Remember - Most great discoveries start with maki

VFMaddict
Offline
Last seen: 1 year 9 months ago
Joined: 06/03/2011 - 08:47
Posts: 1454
Location: London

Here’s are a quick one -

I can jump higher than any skyscraper. How can this be?

"You are making progress if each mistake you make is a new one."

Remember - Most great discoveries start with maki

DavidEF
DavidEF's picture
Offline
Last seen: 3 days 22 hours ago
Joined: 06/05/2014 - 06:00
Posts: 7699
Location: Salisbury, North Carolina, USA

VFMaddict wrote:
Here’s are a quick one -

I can jump higher than any skyscraper. How can this be?


Skyscrapers can’t jump. Wink

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

VFMaddict
Offline
Last seen: 1 year 9 months ago
Joined: 06/03/2011 - 08:47
Posts: 1454
Location: London

Yep

"You are making progress if each mistake you make is a new one."

Remember - Most great discoveries start with maki

VFMaddict
Offline
Last seen: 1 year 9 months ago
Joined: 06/03/2011 - 08:47
Posts: 1454
Location: London

Here’s one of my favorites because although we use it as the expression for an unsolvable question it is actually very easily solved. (Hint: Think laterally.)

What came first the chicken or the egg?

What is the answer?

"You are making progress if each mistake you make is a new one."

Remember - Most great discoveries start with maki

agarb
Offline
Last seen: 6 months 3 weeks ago
Joined: 03/23/2013 - 19:24
Posts: 64
Location: USA

Did you know that in California you can’t take a picture of a man with a wooden leg? Why not?

sandanbob
Offline
Last seen: 1 month 6 days ago
Joined: 01/20/2012 - 15:28
Posts: 390

Because you need to use a camera!

Legolas Jr.
Legolas Jr.'s picture
Offline
Last seen: 6 days 19 hours ago
Joined: 09/17/2013 - 21:55
Posts: 883
Location: Springport, IN

VFMaddict wrote:
For the same reason that Polar Bears don’t…………… Wink

Hehe, yup!

“Strive to be a warrior and a scholar. Be forged in fire and tempered by knowledge. If not, you will either lack the courage to fight for your ideals or lack ideals worth fighting for.”

will34
will34's picture
Offline
Last seen: 6 hours 19 min ago
Joined: 12/18/2012 - 00:12
Posts: 4108
VFMaddict wrote:
What came first the chicken or the egg?

If you want a scientifically accurate answer… here is it:

The egg came first, laid by a bird that was not a chicken.

Boaz
Boaz's picture
Offline
Last seen: 12 hours 50 min ago
Joined: 11/07/2010 - 09:31
Posts: 7720
Location: Birthplace of Aviation

agarb wrote:
Did you know that in California you can't take a picture of a man with a wooden leg? Why not?

because it's in a museum and they have guards 

       καὶ τὸ φῶς ἐν τῇ σκοτίᾳ φαίνει καὶ ἡ σκοτία αὐτὸ οὐ κατέλαβεν

                            

       Dc-fix diffuser film  >…  http://budgetlightforum.com/node/42208

raccoon city
raccoon city's picture
Offline
Last seen: 17 min 33 sec ago
Joined: 10/06/2010 - 02:35
Posts: 17281
Location: रॅकून सिटी Palm Desert CA USA

VFMaddict wrote:
Here’s one of my favorites because although we use it as the expression for an unsolvable question it is actually very easily solved. (Hint: Think laterally.)

What came first the chicken or the egg?

What is the answer?

The egg.

Dinosaurs laid eggs.   Wink

jacktheclipper
jacktheclipper's picture
Online
Last seen: 11 min 19 sec ago
Joined: 10/31/2010 - 21:18
Posts: 4908
Location: Florida , U.S.A.

The rooster ...

What I do

 

Legolas Jr.
Legolas Jr.'s picture
Offline
Last seen: 6 days 19 hours ago
Joined: 09/17/2013 - 21:55
Posts: 883
Location: Springport, IN

There are two planes. One is going from New York to London at a speed of 600 MPH. The other is traveling from London to New York at a speed of 500 MPH.

When the planes meet which one will be closer to London?

“Strive to be a warrior and a scholar. Be forged in fire and tempered by knowledge. If not, you will either lack the courage to fight for your ideals or lack ideals worth fighting for.”

raccoon city
raccoon city's picture
Offline
Last seen: 17 min 33 sec ago
Joined: 10/06/2010 - 02:35
Posts: 17281
Location: रॅकून सिटी Palm Desert CA USA

Legolas Jr. wrote:
There are two planes. One is going from New York to London at a speed of 600 MPH. The other is traveling from London to New York at a speed of 500 MPH.

When the planes meet which one will be closer to London?

That's a tricky one.

When the planes meet, they will be at the same place, so they will both be the same distance to London.

EDIT:  I hope the planes are represented by sprites, and  we only have a sprite collision to deal with.   Evil

JohnnyMac
JohnnyMac's picture
Offline
Last seen: 1 week 6 days ago
Joined: 04/12/2011 - 16:03
Posts: 8864
Location: Eastern PA

jacktheclipper wrote:

The rooster ...

LOL!

Pages