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re: The order of randomly shuffled deck of cards occurring twice, probably never happened.

Posted on 7/28/22 at 9:47 am to
Posted by GumboPot
Member since Mar 2009
119187 posts
Posted on 7/28/22 at 9:47 am to
quote:

How many shuffles are there in one 24 hour period in Vegas or Macao?



A number with 67 zeros behind it is really, I mean really big. And many games in the casinos use multiple decks so that number gets even more ridiculously large after 52 cards.

As a reference it is estimate that there are 75e17 grains of sand on earth. That is 75 with 17 zeros behind it. Almost 4 times less than the chances of the same permutation occurring twice with a randomly shuffled deck of cards.

Posted by Pierre
Baton Rouge
Member since Nov 2005
5289 posts
Posted on 7/28/22 at 9:48 am to
If you shuffle like a casino dealer technically there is only a certain amount of movement for each card. So technically not a random shuffle anyway. A truly random shuffle would have to be done some other way.
Posted by RockyMtnTigerWDE
War Damn Eagle Dad!
Member since Oct 2010
105510 posts
Posted on 7/28/22 at 9:51 am to
I have been in a casino before. This could have been me
Posted by GumboPot
Member since Mar 2009
119187 posts
Posted on 7/28/22 at 9:51 am to
quote:

So technically not a random shuffle anyway. A truly random shuffle would have to be done some other way.




Yeah, skilled shufflers can take a new deck of cards and orderly shuffle them to a desired outcome. I am far from that good.
Posted by StringedInstruments
Member since Oct 2013
18517 posts
Posted on 7/28/22 at 9:53 am to
quote:

I think you greatly underestimate how many people have shuffled how many decks of cards over how many times.


To give you an idea of how many shuffles it would take if you shuffled once per second…

quote:

So, just how large is it? Let's try to wrap our puny human brains around the magnitude of this number with a fun little theoretical exercise. Start a timer that will count down the number of seconds from 52! to 0.

We're going to see how much fun we can have before the timer counts down all the way. Shall we play a game?

Start by picking your favorite spot on the equator. You're going to walk around the world along the equator, but take a very leisurely pace of one step every billion years. The equatorial circumference of the Earth is 40,075,017 meters. Make sure to pack a deck of playing cards, so you can get in a few trillion hands of solitaire between steps.

After you complete your round the world trip, remove one drop of water from the Pacific Ocean. Now do the same thing again: walk around the world at one billion years per step, removing one drop of water from the Pacific Ocean each time you circle the globe. The Pacific Ocean contains 707.6 million cubic kilometers of water. Continue until the ocean is empty. When it is, take one sheet of paper and place it flat on the ground.

Now, fill the ocean back up and start the entire process all over again, adding a sheet of paper to the stack each time you’ve emptied the ocean.

Do this until the stack of paper reaches from the Earth to the Sun.

Take a glance at the timer, you will see that the three left-most digits haven’t even changed. You still have 8.063e67 more seconds to go. So, take the stack of papers down and do it all over again. One thousand times more. Unfortunately, that still won’t do it. There are still more than 5.385e67 seconds remaining. You’re just about a third of the way done.

Posted by JohnnyKilroy
Cajun Navy Vice Admiral
Member since Oct 2012
35606 posts
Posted on 7/28/22 at 9:54 am to
quote:

I think you greatly underestimate how many people have shuffled how many decks of cards over how many times.



Holy shite lol
Posted by Displaced
Member since Dec 2011
32726 posts
Posted on 7/28/22 at 10:01 am to
You're ignoring that every time a deck is shuffled, a new instance has now occurred.

You shuffle once, that is one instance. You shuffle again, it doesn't match your first instance but a second instance is now created and you have two possible points to match. So in and so forth.

I'd think it is more than likely that the same order has been repeated after a shuffle in the history of shuffling cards.

This is similar to the birthday paradox.

In a room of just 23 people, there is a 50-50 chance that at least 2 people share a birthday. In a room of 75 there's a 99.9% chance.
Posted by High C
viewing the fall....
Member since Nov 2012
54158 posts
Posted on 7/28/22 at 10:06 am to
quote:

Depends on the hand.


Maybe I wasn’t clear enough. I mean the exact two cards. Not just 10/8, but 10c/8h.
Posted by BumKnee
Member since Oct 2021
122 posts
Posted on 7/28/22 at 10:06 am to
quote:

look up some stats on PLO.


Keep the Palestinians out of this…
Posted by TheDeathValley
New Orleans, LA
Member since Sep 2010
17241 posts
Posted on 7/28/22 at 10:09 am to
52! is a cool concept
Posted by OWLFAN86
The OT has made me richer
Member since Jun 2004
176609 posts
Posted on 7/28/22 at 10:09 am to
quote:

We did the math
this didnt happen
Posted by Snek
Member since May 2016
136 posts
Posted on 7/28/22 at 10:12 am to
I think its once every 1326 hands.

This post was edited on 7/28/22 at 10:25 am
Posted by geauxtigers810
baton rouge
Member since Jun 2004
529 posts
Posted on 7/28/22 at 10:13 am to
This is the correct answer.
Posted by sportsaddit68
Hammond
Member since Sep 2008
5885 posts
Posted on 7/28/22 at 10:15 am to
quote:

You're more likely to win the lottery.


You can win the lottery multiple times with compared to that ratio.
Posted by GumboPot
Member since Mar 2009
119187 posts
Posted on 7/28/22 at 10:17 am to
quote:

This is similar to the birthday paradox.

In a room of just 23 people, there is a 50-50 chance that at least 2 people share a birthday.


I don't think this is comparable to the random permutations of a randomly shuffled deck of cards.

Correct me if I'm wrong, the 23 people are comparing there birth dates to each other for comparisons which is 253. Compare against 1 then 2 then 3 all the way up to 22...don't compare against yourself and add them up to 253. That's 253 chances out of 365 dates. That's better than a 50% rate, right?
Posted by GumboPot
Member since Mar 2009
119187 posts
Posted on 7/28/22 at 10:19 am to
quote:

I once played cards with a guy who dealt himself a royal flush 5 times in a row.

I lost a lot of money, but it was worth it to see such a rare event!





He robbed you.
Posted by Downeast12
Member since Jun 2022
561 posts
Posted on 7/28/22 at 10:23 am to
quote:

Or one in 52! (52 factorial


So you’re saying it’s the same as the Atlanta Falcons super bowl odds?
This post was edited on 7/28/22 at 10:24 am
Posted by Who_Dat_Tiger
Member since Nov 2015
18154 posts
Posted on 7/28/22 at 10:27 am to
Even though the Falcons are supposed to go winless this season, I’d still bet $1 on them to win the SB given those odds
Posted by BPTiger
Atlanta
Member since Oct 2011
5331 posts
Posted on 7/28/22 at 10:28 am to
Yeah when I initially ready I didn’t realize he meant back to back.
Posted by Displaced
Member since Dec 2011
32726 posts
Posted on 7/28/22 at 10:31 am to
quote:

I don't think this is comparable to the random permutations of a randomly shuffled deck of cards.

Why? It's the same, just on a much larger scale.

Rather than 365 individual occurrences, there are 52!
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