Author Topic: Riddles!  (Read 62078 times)

Offline Yo ssi

  • Dansdeals Presidential Platinum Elite
  • ********
  • Join Date: Aug 2019
  • Posts: 3998
  • Total likes: 1275
  • DansDeals.com Hat Tips 38
  • Gender: Male
    • View Profile
Re: Riddles!
« Reply #740 on: April 27, 2021, 10:31:34 PM »
Currently* offering $5! (cashapp) to the first person to PM me with the correct answer. Please don't spam.

*Offer may expire at anytime without notice.
Now dead, due to the lack of a PM :)

Offline yungermanchik

  • Dansdeals Lifetime Platinum Elite
  • *******
  • Join Date: Nov 2018
  • Posts: 1297
  • Total likes: 885
  • DansDeals.com Hat Tips 0
    • View Profile
  • Location: Previous Signatures: If you chapped hana'ah from a post, like it; You think you know the answers and things are the way they seem.. it just ain't so -The Rebbe from Lublin-
Re: Riddles!
« Reply #741 on: April 27, 2021, 10:35:21 PM »
The Sacred Rac

         An Indian anthropologist, Chandra Thapar, made a study of foreign culture which had customs similar to those of his native land.  One culture in particular fascinated him because it reveres one animal as sacred, much as the people in India revere the cow.

         The tribe Dr. Thapar studied is called the Asu and is found on the American continent north of the Tarahumara of Mexico.  Though it seems to be a highly developed society of its type, it has an overwhelming preoccupation with the care and feeding of the rac -- an animal much like a bull in size, strength and temperament.  In the Asu tribe, it is almost a social obligation to own at least one if not more racs.  Anyone not possessing at least one is held in low esteem by the community because he is too poor to maintain one of these beasts properly.  Some members of the tribe, to display their wealth and social prestige, even own herds of racs.

         Unfortunately the rac breed is not very healthy and usually does not live more than five to seven years, for it has a tendency to throw its shoes often.  There are rac specialists in each community, perhaps more than one if the community is particularly wealthy.  These specialists however, due to the long period of ritual training they must undergo and to the difficulty of obtaining the right selection of charms to treat the rac, demand costly offerings whenever a tribesman must treat his ailing rac.

         At the age of sixteen in many Asu communities, many youths undergo a puberty rite in which the rac figures prominently.  The youth must petition a high priest in a grand temple.  He is then initiated into the ceremonies that surround the care of the rac and is permitted to keep a rac.

         Although the rac may be used as a beast of burden, it has many habits which would be considered by other cultures as harmful to the life of the society.  In the first place the rac breed is increasing at a very rapid rate and the Asu tribesmen have given no thought to limiting the rac population.  As a consequence the Asu must build more and more paths for the rac to travel on since its delicate health and its love of racing other racs at high speeds necessitates that special areas be set aside for its use.  The cost of smoothing the earth is too costly for any one individual to undertake; so it has become a community project and each tribesman must pay an annual tax to build new paths and maintain the old.  There are so many paths needed that some people move their homes because the rac paths must be as straight as possible to keep the animal from injuring itself.  Dr. Thapar also noted that unlike the cow, which many people in his country hold sacred, the excrement of the rac cannot be used as either fuel or fertilizer.  On the contrary, its excrement is exceptionally foul and totally useless. Worst of all, the rac is prone to stampedes in which it runs down anything in its path, much like stampeding cattle.  Estimates are that the rac kills thousands of the Asu in a year.

         Despite the high cost of its upkeep, the damage it does to the land, and its habit of destructive stampedes, the Asu still regard it as being essential to the survival of their culture.
What is a Rac?
Who are the Asu?
Small people talk about other people.
Average people talk about things
BIG PEOPLE TALK ABOUT IDEAS.

Offline Yo ssi

  • Dansdeals Presidential Platinum Elite
  • ********
  • Join Date: Aug 2019
  • Posts: 3998
  • Total likes: 1275
  • DansDeals.com Hat Tips 38
  • Gender: Male
    • View Profile
Re: Riddles!
« Reply #742 on: April 27, 2021, 10:38:58 PM »
Label the colors {1,2,3k}. The first one says the sum of the hats in front of him modk (the last n−1 persons). After this the second one can deduce which number corresponds to the color of his hat (by subtracting the sum that he can see minus the sum previously said).

The third person, having heard all of this, can now deduce the sum of the last n−2 people, and by substracting this from the sum of the hats he sees (last n−3) he can deduce which hat he has.

This process continues on to the last person. All of them are saved except for the first one, which survives with probability 1/k. It is clear that no matter which strategy we follow, the probability the first person survives is 1/k. So this strategy is optimal.

The maximum strategy number is hence n−1.

Source: https://math.stackexchange.com/questions/1602078/variant-of-prisoners-and-hats-puzzle-with-more-than-two-colors/1602086#1602086
@SSLPhD curious if you just C&Ped or you understand what's going on?

Offline EliJelly

  • Dansdeals Lifetime Platinum Elite
  • *******
  • Join Date: Jan 2019
  • Posts: 1546
  • Total likes: 1084
  • DansDeals.com Hat Tips 1
    • View Profile
Re: Riddles!
« Reply #743 on: April 27, 2021, 10:41:01 PM »

Offline yungermanchik

  • Dansdeals Lifetime Platinum Elite
  • *******
  • Join Date: Nov 2018
  • Posts: 1297
  • Total likes: 885
  • DansDeals.com Hat Tips 0
    • View Profile
  • Location: Previous Signatures: If you chapped hana'ah from a post, like it; You think you know the answers and things are the way they seem.. it just ain't so -The Rebbe from Lublin-
Re: Riddles!
« Reply #744 on: April 27, 2021, 10:47:09 PM »
Car
Usa
Now for the 3rd Question on the famous assignment:
Do you think this article presents an accurate view of the Asu?  :P
Small people talk about other people.
Average people talk about things
BIG PEOPLE TALK ABOUT IDEAS.

Offline EliJelly

  • Dansdeals Lifetime Platinum Elite
  • *******
  • Join Date: Jan 2019
  • Posts: 1546
  • Total likes: 1084
  • DansDeals.com Hat Tips 1
    • View Profile
Re: Riddles!
« Reply #745 on: April 27, 2021, 10:58:26 PM »
Now for the 3rd Question on the famous assignment:
Do you think this article presents an accurate view of the Asu?  :P
No, because it misses another thing they adore tremendously, the supreme killing machine - guns.

Offline SSLPhD

  • Dansdeals Platinum Elite + Lifetime Silver Elite
  • *****
  • Join Date: Jul 2015
  • Posts: 583
  • Total likes: 118
  • DansDeals.com Hat Tips 0
    • View Profile
  • Location: My couch
Re: Riddles!
« Reply #746 on: April 27, 2021, 11:17:23 PM »
@SSLPhD curious if you just C&Ped or you understand what's going on?
The PhD is in Computer Science...  Their wording answered the question; I can rephrase if anyone is interested.
AK,AZ,CA,CO,CT,(DE),FL,HI,(IL),ME,MD,(MA),MI,MN,MT,NV,NH,NJ,NY,OR,PA,(RI),TX,UT,VT,VA,WA,WI,WY

Offline Euclid

  • Dansdeals Presidential Platinum Elite
  • ********
  • Join Date: Jun 2010
  • Posts: 2527
  • Total likes: 2290
  • DansDeals.com Hat Tips 3
    • View Profile
Re: Riddles!
« Reply #747 on: April 28, 2021, 12:06:32 AM »
The PhD is in Computer Science 
Nice! Not too many of these in the frum world :)

Offline Randomex

  • Dansdeals Gold Elite
  • ***
  • Join Date: Aug 2018
  • Posts: 171
  • Total likes: 457
  • DansDeals.com Hat Tips 0
  • Gender: Male
    • View Profile
  • Location: Lakewood
  • Programs: MSPaint, Notepad, Firefox
Re: Riddles!
« Reply #748 on: April 28, 2021, 11:09:05 AM »
Chess.
I no longer have constant Internet access, so you won't be seeing quite as much of me.

Offline Mootkim

  • Dansdeals Platinum Elite + Lifetime Silver Elite
  • *****
  • Join Date: Sep 2014
  • Posts: 643
  • Total likes: 102
  • DansDeals.com Hat Tips 2
    • View Profile
  • Location: New York
Re: Riddles!
« Reply #749 on: April 28, 2021, 11:26:06 AM »

Offline justmeha

  • Dansdeals Lifetime Platinum Elite
  • *******
  • Join Date: Feb 2019
  • Posts: 1329
  • Total likes: 141
  • DansDeals.com Hat Tips 9
    • View Profile
Re: Riddles!
« Reply #750 on: April 28, 2021, 11:35:45 AM »
I can rephrase if anyone is interested.
i would be

Offline Yo ssi

  • Dansdeals Presidential Platinum Elite
  • ********
  • Join Date: Aug 2019
  • Posts: 3998
  • Total likes: 1275
  • DansDeals.com Hat Tips 38
  • Gender: Male
    • View Profile
Re: Riddles!
« Reply #751 on: April 28, 2021, 12:07:05 PM »

Offline SSLPhD

  • Dansdeals Platinum Elite + Lifetime Silver Elite
  • *****
  • Join Date: Jul 2015
  • Posts: 583
  • Total likes: 118
  • DansDeals.com Hat Tips 0
    • View Profile
  • Location: My couch
Re: Riddles!
« Reply #752 on: April 28, 2021, 12:46:54 PM »
i would be
Just as in the 2-color hat, the person in the back has no way of knowing the color of their own hat.  Their job is to give information to the people in front so that they can solve their own color.

The solution should work for any number of colors, but we'll do 3 as that was the riddle.  Suppose we have red, green, and blue hats.  In advance, they have time to work out a plan, and they assign a number from 1 to 3 to each one of those colors.  For example, red is 1, green is 2, and blue is 3.  Let's assume there are 6 people; I'll call them P1...P6, with P1 being in back, moving to P6 in front.  P1 adds up the values of all the hats they see.  For example, if they see RGBBG (their own is concealed), they would add 1+2+3+3+2=11.  Then they do modulus 3 (sometimes the symbol % is used), which is just taking the remainder when the number is divided by 3.  11%3=2.  (11/3 = 3 rem 2)  P1 says "green," since 2 is green.  (I suppose for 0 they would say "blue," and is fine.)  This may be correct or incorrect, the original problem said something to the effect that all but one had to be correct.  P1 is the sacrifice.  P2 sees GBBG or 2+3+3+2=10.  P2 now knows that their hat is RED, because 1 is the only number between 1 and 3 that can be added to 10 to get 2 when you mod it by 3.  P2 says "red."  P3 sees BBG or 3+3+2=8, and knows that their hat must be GREEN because if previous color is red, P2 must've seen values summing to 10, and 10-8=2=green.  And so on.

I hope this is clear and doesn't give people a headache.
AK,AZ,CA,CO,CT,(DE),FL,HI,(IL),ME,MD,(MA),MI,MN,MT,NV,NH,NJ,NY,OR,PA,(RI),TX,UT,VT,VA,WA,WI,WY

Offline Randomex

  • Dansdeals Gold Elite
  • ***
  • Join Date: Aug 2018
  • Posts: 171
  • Total likes: 457
  • DansDeals.com Hat Tips 0
  • Gender: Male
    • View Profile
  • Location: Lakewood
  • Programs: MSPaint, Notepad, Firefox
Re: Riddles!
« Reply #753 on: May 05, 2021, 07:29:33 PM »
For future readers, the last one was black-flag/white-flag/crown/crown/crown/crown/horse/horse/horse/horse.

(Ignoring the flag might make this one easier.)
I no longer have constant Internet access, so you won't be seeing quite as much of me.

Offline whYME

  • Dansdeals Presidential Platinum Elite
  • ********
  • Join Date: May 2008
  • Posts: 3176
  • Total likes: 1136
  • DansDeals.com Hat Tips 3
  • Gender: Male
    • View Profile
Re: Riddles!
« Reply #754 on: May 05, 2021, 10:35:36 PM »
Do you think this article presents an accurate view of the Asu?  :P
I would say that almost everything it says there is accurate, but it doesn't present an accurate view of the Asu.

(i.e. Lies by omission.)

Offline Randomex

  • Dansdeals Gold Elite
  • ***
  • Join Date: Aug 2018
  • Posts: 171
  • Total likes: 457
  • DansDeals.com Hat Tips 0
  • Gender: Male
    • View Profile
  • Location: Lakewood
  • Programs: MSPaint, Notepad, Firefox
Re: Riddles!
« Reply #755 on: May 27, 2021, 11:37:57 AM »
, , ,

Tetris.
I no longer have constant Internet access, so you won't be seeing quite as much of me.

Offline Yehudaa

  • Dansdeals Presidential Platinum Elite
  • ********
  • Join Date: Mar 2018
  • Posts: 2719
  • Total likes: 1198
  • DansDeals.com Hat Tips 82
    • View Profile
  • Location: YYZ
Re: Riddles!
« Reply #756 on: June 04, 2021, 03:27:50 PM »
Someone's mother has four sons.

North, South and East.

What is the name of the fourth son.

Offline Yonah

  • Dansdeals Platinum Elite + Lifetime Silver Elite
  • *****
  • Join Date: Mar 2014
  • Posts: 516
  • Total likes: 287
  • DansDeals.com Hat Tips 4
    • View Profile
Re: Riddles!
« Reply #757 on: June 04, 2021, 03:29:55 PM »
Someone's mother has four sons.

North, South and East.

What is the name of the fourth son.
That it is!

Offline Realshlomo

  • Dansdeals Gold Elite
  • ***
  • Join Date: Jul 2017
  • Posts: 249
  • Total likes: 50
  • DansDeals.com Hat Tips 1
    • View Profile
Re: Riddles!
« Reply #758 on: June 04, 2021, 03:30:00 PM »
Someone's mother has four sons.

North, South and East.

What is the name of the fourth son.
Someone?

Offline Lurker

  • Dansdeals Presidential Platinum Elite
  • ********
  • Join Date: Jul 2019
  • Posts: 4661
  • Total likes: 5105
  • DansDeals.com Hat Tips 1
    • View Profile
  • Location: As always, silence is NOT an admission of agreement on DDF. It just means that people lack the stamina to keep on arguing with made up "facts", illogical arguments, deceiving statements, nasty and degrading comments, and fuzzy math. - @yelped
Re: Riddles!
« Reply #759 on: June 04, 2021, 03:42:41 PM »
Someone's mother has four sons.

North, South and East.

What is the name of the fourth son.

Yes.
Failing at maintaining Lurker status.