Maths Card Trick: Last to be chosen

[alfiestoppani]

did anyone who picked 4 at the start regret it when the string of 4,5,4,5,4,5, came up? <:3D~

[thepowerofmagic2]

jack of diamonds



[Jarod3926]

no friends?

[randominfo316]

No I got a 4

[zantiertasa]

Hey, I've written a quick program to generate the outcomes for input or random shuffles! It has verified that in the video's example, every number from 1 to 10 gives 9 of spades.

BUT, my program gives frequent examples of there being 2 possible answers. Here's one of those examples (suit is irrelevant): A 6 5 5 J 10 Q 8 8 10 9 4 A 9 J Q 7 Q 5 2 J 2 3 10 Q 6 A 5 K 9 7 4 4 8 7 3 K K 8 2 6 4 2 K J 3 3 10 9 7 A 6

Choosing 1, 2, 3, 6, 7 or 8 lead to card value 7

whereas 4, 5, 9 and 10 lead to 9.

[zantiertasa]

@zantiertasa just watched the video response... *face palm*

[singingbanana]

@zantiertasa I also wrote a little article about the trick. The link is in the response video description.

[luigi90900]

Hmmmm... 1.5 works.

[CDawgTV]

mine was the 5 that you had in your hand and almost chose

[101animations]

no, mine was 4 of hearts

[xXextraslastaXx]

Am I stupid or this trick doesn't work? I exactly did what you said, but it doesn't work :(

My last chosen card was king of clubs with the number 5 as first chosen.

[xXextraslastaXx]

@xXextraslastaXx Sorry, I've just seen the tutorial video. You are great! :D

[lightangelanime]

wow it realy was 9 o:

[mathgeek11]

nope. close seven of spades

[NathanTomkinsMagic]

it was the 3 of spades

[MagicROCKS97]

9 of spades damn your good

[Padarom]

Either I were too stupid to count or it was the ace of hearts :D

[boffinindahouse]

i had 10 as a starting number and my last number was the 4 of hearts.

me and my friends hav been doing this trick at school and recorded the results from the experiment. we used the same card formation whilst starting from 1-10 and wrote down the last card we saw. everytime we started from 1-8, the end number was the same. however, the results from 9 and 10 as a starting number showed no correlation. thought i'd just share that with u

=)

[MagicROCKS97]

@boffinindahouse works with 10 as a beginning number

[boffinindahouse]

@MagicROCKS97 i just did it again, and its ends with 4 of hearts.....

[MegaStefan456]

no it was 8

[maxgician9]

yes! it was a 9!

[TheJacoby119]

No that was not my number

[speedynba3]

omygezzzuzuzuzuzuzh

[Tarsi666]

its so sad that you say you don't have any friends :( poor you :L

and my last chosen card was indeed the 9 Ö

[beno3131]

ha ha you look tiny holding those huge cards!

a great trick

[mathwhiz3]

Where did you get those huge cards?

[ThomasAnthonyBowman]

It was 9. Hahaha. Awesome :)

[Russelia224]

shit ballz :D

[supermismag822]

where did you get your cards

[samwilliams101]

Yes you did

[crescentguys999]

yup

[hawkfake]

I wonder can he count cards?

[darkdudironaji]

"I should get a friend to do this, but I don't have any."

lol I wonder if that came out wrong or if I should stop laughing about it... now I feel bad.

[lennon1252]

BECAUSE YOU MADE ALL THE PICTURE CARDS WORTH 5...IT WILL ALWAYS WIND UP THE NEXT TO THE LAST CARD WHICH WILL BE THE CHOSEN CARD...IT'S JUST MATHEMATICAL....

[DanishDraqon]

@lennon1252 not always, there is just below 90% chance that you will get it right, check his latest video.

[ZAPDUNGAA]

it's mathematical...it has to work..especially since all the picture cards are worth 5

[MagicandCreativity]

Maybe i counted wrong, but i did focus quite hard :P

[MagicandCreativity]

Min was 4 of hearts

[POISONporter121]

@MagicandCreativity same!

[Hall0weenLover]

Wow thats Bad ass Mine was 9.

[eminemnr1]

mine was 3

[darkdudironaji]

@eminemnr1 it is impossible to get 3. The last 3 would make your last chosen card 4

[eminemnr1]

@darkdudironaji i think i know better what i got .

[darkdudironaji]

@eminemnr1 no, you dont. If you land on 3 you count 3 and land on 4, which would be your last chosen card. It's obvious you either dont understand the trick, or youre just dumb.

[emeemmanuel]

yes it was 9!!!

[Berntisso]

Mine was 3.

[xCelsius451x]

Amazing!!!

[lennic95]

Mine was the last card....which in it's self was quite impressive.

[zh1412]

Yes!! It was the nine!! woot

[FoodMasher101]

I lost count... You should have counted or something... Or I may have a bad memory

[36trooper]

Yea it worked.

[CountryGalAt11]

o.O didn't work for me

[NotYourAverageJoe321]

tutorial plz, this trick is long but as long as your doing it to someone failry smart theyll follow long, you gotta react quick and have basic math but ist pretty cool

[WhiteHenny]

@NotYourAverageJoe321 "basic math"? you gotta be able to count, slowly. that's all.

[M1M3S1S]

dindn understood this very well...the number  i choose was 3

[SuperMastermind3000]

@M1M3S1S well lets put it this way u picked 3 so pertend the card was 4 of dimonds on ur number then u count to 4 then if its a face u count to five no matter what

that help a little

[SuperMastermind3000]

nice it worked

[CelloMusic4ever]

Nope. I had the ace. They are worth 5 right?

[cadwini]

@CelloMusic4ever Aces are worth one.

[impossiblemission4ce]

@CelloMusic4ever wrong

[dammilo]

explanation please!

[ben8228]

" I should get a friend to do this really, but I don't have any"

LOL at the mathamagician joke

[swantomerable]

nice

[MrPurpleWhitey]

WRONG.

[789marsh]

woah that was awesome. Hey I know this was a long time ago but do you think that you could make a nother tutorial on how to crack the viginere cipher because I didn't really get it the last time

[TheConceptLove]

Amazing ! Going to do it with friends ! :D thank you !

[stoker48]

worked for me. MAGIC!

[mathgeek11]

i got the eight of spades... not the nine sorry

[txelcat]

Nice one!

[hoothoot12345678]

ahaha, it was my card of course, im assuming the deck was stacked ? Really looking forward to the explanation.. (: Also, it was so hard concentrating because u had that smile that made me lol throughout the whole trick, so i had to write each card down to assure i didnt lose something :P

[leungclj]

any explanation?

[TyYann]

Very nice!

[gtq838]

you got it right... it seems to be a setup though. I could be wrong but if it were truely a random deck then instead of the 9 that we all got at the end it could have just as easily been one of the other two cards behind it. Unless of course its just always the third to last card.

[hellsing233x]

somehow this doesn't look that complicated, I mean, I could do it, without knowing anything mathematic about it of course

[BlackWolfRose]

Please, show us how to do this. I want to dewilder my friends with another one of your awesome card tricks.

[LosDynasty]

Your card is getting bigger and bigger lols

[millineu]

aaahahha....:'(

[damnnright]

:)

[juliman777]

maybe I lost count but it worked by 3 for me. But the second time I tried with 4 as a starting number I got the four of hearts as the last card

[RandomNinjaOfEvil]

Yes it was. Very good! :D

[IforgotMyMedication]

"i could make one of my friends to do this but i don't have any" lol :D

[boumbh]

I made a simulation (that may be flawed XD). The result I got is that 58% of the combinations of a card deck makes this trick working for any initial number (between 1 and 10). If the magician counts beginning with 1, he has around 85% to obtain the same last card as the watcher. The trick is working better by making the faces worth 1 (but it's less impressive ;) ): ~94% success.

[norrisonthespot]

@boumbh For 1-10 with a 52 card deck probability just over 89% if I remember this old effect correctly. However I could be wrong. Singing banana is sure to know! I used to get the spectator to roll a die as I look away and to use the outcome as the card to start from. This brings up the probability up somewhat.

[boumbh]

@norrisonthespot The simulation gets about 66% and 87% for picking a number between 1-6 (resp 58% and 85% for 1-10).

I found a doomed card arrangement which gives 5 possible last card: 1 2 3 4 5 6 7 8 9 10 1 10 2 9 3 8  4 7 1 6 2 6 7 8 9 10 3 10 4 9 1 8 2 7 3 6 4 5 5 5 J J J J Q Q Q Q K K K K

The five last cards are all reachable. I don't think there is worse ^^ (does not work for 1-6).

[watrick144]

is the chosen card always the third to last card?

[boumbh]

@watrick144 No. It's obviously one of the ten last cards. Starting from the end, you can give away the 10th if it's not a 10, the 9th if it's lower than 9, the 8th if it's lower than 8, etc. But I think you can't know for sure which one is the chosen one.

[piginaphonebox]

yes it was it

[piginaphonebox]

lol no friends 1:38

[Sandman267]

yah! got it right =)

#startedwith4

[vejj5454]

I ended with the nine of hearts?

[siy777]

i started with 4 and finished with nine

i think i no how it works................

no matter wat no. u start with u will always get one of the last cards in this ocation it was 9 btw singing banana i live in the same country uk and the snow is brill wat r ur thoughts on the snow xxxx

[D4rkX007]

I started with 7 and finisshed with 9 =)

Nice trick!

[TheFlyingTiger129]

No friends? :-(

[RWoosten]

That's great, but I don't get it at all I'm affraid...!

[Ro6278]

i kept seeing numbers counting down know and then like a 7 before a 6 so if you landed on on of those you'd get the same next card and this happend quiet alot so i suspect thats how it works

[hanerito]

9 of spades ;D

[RiktigeKentsson]

Started with one and finished with 9 of spades. Awesome!

[JuusoTurunen]

I can't really get how that can happen if it's not really somehow arranged deck...

But it worked.

So I have to test that :)

[hamkam4]

yes



[lennic95]

Wow! I don't get it though "/

[BassmrDK]

No friends :(

[eneses93]

I started with 5 and finished with 9 of spades :)

[thetommantom]

i picked 7 to begin and ended with 4 <3, i may have messed up

[thetommantom]

@thetommantom nevermind, it works, i counted till i got the number i had picked, not counted off the first number then at the end picked that card, thats pretty sweet!!

[08firthf]

I got a nine, didn't remember whether it was of clubs or spade but based on what everyone else is saying and what it probably was the nine of spades. My first number was 3...But well done! Very cool!!!

[mujijibu]

9 of spades. Well done :D

[HolbytaTook]

Aw man if you can read my mind, I hope you're my friend!

[xorgawasx]

Very nice :)

[eskimokid]

Yeah!

[ICE1ICE2ICE3ICE4]

9! Nice!

[ChRiSiMoN]

9 and yes

[millineu]

Now it doesn't even seem probable that all the number sequences will converge...

[norrisonthespot]

All roads lead to Rome :) The deck can be shuffled by the spectator. Does not work 100% of the time if I remember the probability. However there is room for improvement and experimentation. If you want to have the road junctions connect earlier on in the deck then limit the number of avenues and/or number of cards in play. Limit down either through using card names rather than values or through using a die (just 1-6 then). Then with a normal 52 card deck the probability will be near 100%.

[norrisonthespot]

@norrisonthespot Sorry, I meant increase the amount of cards in play. For example use a tarot deck? :)

[GuaidaoKID]

yes that's the card i chosen

how can you do that?



[GuaidaoKID]

yes that's the card i chosen

how can you do that?

[millineu]

It seems to me, (after making several colour coded tables) it doesn't always have to work with a randomly shuffled deck. I think there was an inherent risk in a randomly shuffled deck that it would have been impossible for you to predict the final number, given certain sequences. (even though the probability of such a sequence may be very small) I can't wait for you to prove me wrong though :D If you have stacked the deck in any way I will be very disappointed!!!!

[kyle7447]

YES that was it!

[KratosZX]

God you are a genius!

[Alfalotter]

5 gets the nine of spades

[avengedownt]

started on 3 and ended up on 9 of spades

[i347ch33s3]

started on 7, ended on 9of  spades

[LordOfFreedom]

I actually tried starting with 1 and 8, and both number lines merged at the 28th card. With 1 it went 1 > ace > 10 > 2 > jack > 2 > 3 > king > queen of clubs (28th)

With 8 it went 8 > 6 > king > 9 > queen of clubs (28th)

And I eventually got that 9 of spades as my last card.

[guitargod32co]

does this have to do with the fact that the 9 of spades, which, i think, is the answer for all numbers, is the fiftieth card, and fifty is the last multiple of ten that occurs in a deck of cards? i doubt it does, but this really puzzles me.

[charleybucketcdp]

waaaaaaaaaaaaaaaaaaaaaaaaat

God, I love your videos!!

[mohmo970]

you got me :D

[fahgsdhjh]

I got the 9, lol.

[TheWolzen]

I started with 9, ended on on Ace.

[Xpress4ever]

@TheWolzen you can't end on an ace unless the last card is an ace, which it isn't, it's a four.

[Xpress4ever]

@TheWolzen you can't end on an ace unless the last card is an ace, which it isn't, it's an eight

[Breneric]

Hahahah, I got number 9 ! Thanks mate, that was fun!

[aceserve]

loved it! can't wait to try it on my students.

[TH3Z3R0H0UR]

yes x.x

[eXisentZ]

9 of spades you got mine right.

[eoin1234567890]

damn, well played

[SubscribeToTyler]

Awe ill be your friend!!! :D

[zurizeno]

dsfgfsfdsgfdsgdfs

[zurizeno]

jnjlnljnkl

[Duvmasta]

But why maths and not math?

[trevmister8]

I tried 4 and got something different. Maybe I messed up?

[TheHungarianCuber]

L0L I got 6 then 9, thumbs up

[123456lvr]

I tried it twice and got the five of hearts both times

[singingbanana]

@123456lvr Tell us the number you chose at the beginning and people will check that.

[geasscanceler16]

@singingbanana I started with 7 and ended with the nine of spades? am i not getting it or did i do something wrong?

[thedualmobius]

@123456lvr The 5 of hearts was 19 from the end. If you continued the pattern as instructed you would have eventually ended up at the 9 of spades as he predicted.

[senken12]

Would it always be 3rd to last card unless it's an Ace or a 2?

[RochardE24]

very nicely done, tutorial please?

[zurizeno]

@RochardE24 Spiked math explains this card trick really well. comic 317 Kruskal card trick

[zurizeno]

@RochardE24 Spiked math explains this card trick really well. comic 317 Kruskal card trick

[plazmotech]

OMG

[CoolInMyOwnWay]

...BURN THE WITCH!

[MrBabs12345]

I met you :P ahah,, first time youve ever been recognised... kind of chuffed to be honest. : )

[singingbanana]

@MrBabs12345 I was far more excited about that than you were.

[MrBabs12345]

@singingbanana I highly doubt that,, when i saw you i couldnt quite believe it :P

[deetaha]

@singingbanana I too saw you but walking across the core in the CMS but was too shy to tell you hi :D

[singingbanana]

@deetaha Pfft. Nonsense on a stick. It's only me, I'm very friendly. Next time.

[tmaduct5]

il be ur friemd

[ljllucky62]

GAH YOU MIND READER!!!

[AtomBombsAndGrenades]

What! The! Hell!

[JustAKidInTheHall]

Yep

[Duvmasta]

it's math you idiot, not maths!!!!

[Xerxes4242]

@Duvmasta It's maths everywhere except north america

[QCHitch]

@Duvmasta It's "math" in the US and "maths" in the UK.

[mightysephiroth]

@Duvmasta Its maths since its short mathematics not mathematic

[Discordanian]

@Duvmasta it's mathematics not mathematic, hence the 'maths'.

[FreerunnerDave]

how do you come up with this stuff???

[tomnotass1]

you got my last chosen card and the last card left was number 8 whcih was my first chosen card , well done mate nice hair cut too

[GearAnthiils]

What kind of drug do you take ?

[ernestryles]

grrrrrr ya got me