Permutations

[swordlord16]

should had had blue balls lol. lol sorry just couldn't help it

[member1a1]

Thanks A Lot

[JointCracky]

i'm a little confused. Let's say there are like...9 sweets in the box and out of 9 you pick 4 of those sweets. so how many ways exist to pick those 4 if the order doesn't matter?

i have 3,024 ways... and my brain disagrees.. i mean its 9!/5! = 6*7*8*9 .... i think i made a mistake here, help pls.

[17LilSouljah]

why in the world is this on the SAT :(

[moka22051]

what in the world is a factorial :(

[CAPtoROTC]

@moka22051 A factorial is when you multiply that number by all the positive integers below it. For example, 7! is 7*6*5*4*3*2*1.

[BrokenBjartur]

It's a miracle the stutter at 01:12 didn't have a "shit" in it. Sit and chair are perfect ingredients for this to happen.

[nickrohn93]

Well i was getting slightly confused near the end. 

[toplad007]

Can you please explain the why do we multiply these 7x6x5 or 3x2, whats the logic.

[ninjaturtle205]

i hv a magenta ball

[gamerstormz67]

@ninjaturtle205 lol a brown ball n yello ball too and he puts them on the cups!

[yumeybaconcutout]

ball in a cup!!!

[ahhhhjjjj]

I love the mathematics and how you teach but I must say I lost it at "I have three balls" XD lmfao

[paulceltics]

i see you were hesitant to select cups...

[mcrsramirez]

I really thank you for this video... it's very comprehensive... thank you so much... :-)

[LAnonHubbard]

Good explanation. I've always found this sort of thing confusing but this video was very clear. Great intuition gained.

[loverofbeats]

please do combinations with repetition! it would be greatly appreciated! :D

[redrose11123]

wow wow wow wow wow wow wow wow wow wow wow wow wow wow THANK YOU!

[SuPeRm4n100]

idk how you know so much...thanks alot man!! :) really helped

[frankthetank1285]

Thanks, your videos are always great!

[matlab22]

You sound like Sean Blumberg on Felicity the series...lol...I've been watching reruns of Felicity all day today while I do my homework.

[GMmarine]

This was a great review. :)

[joeybenn]

What if one expanded the situation to be able to have all seven people on one chair and none on the others?

[phiphers]

how many permutations would they be on 2 girls and a 1 cup?...

[WellConditionedChimp]

@phiphers hahaha excellent

[detroid89]

@phiphers looooooooooooooooooooooool!

[bryanfuel]

@phiphers 2

[gregorygaming]

@phiphers 2!/(2-1)!=2

[linoafew]

u know what .... i just like it, all i say is that u r awesome in all ur videos ...i wonder if u have a dvd set for all the advanced math...cheers ...

[theceemabiswas]

I love when math is demistified

[personwithface29]

I really appreciate this combinations are easy as pie but this is another story

[jarrasoma]

What if there are less things than spots?

[Ryoroyzu]

@jarrasoma

Well, given i.e. 5 cups and 3 balls - and you put one ball in one cup - you'd have this;

Cup 1: Ball A

Cup 2: Ball B

Cup 3: Ball C

Cup 4: No ball

Cup 5: No ball

Now, there's a problem with our ascertion. Can you see it? The question now is better answered as a relation; In how many ways can you place a cup and a ball together? That way, the places would be the "k", and the other relation would represent the "n".

[jarrasoma]

Ah... I see, its just a reverse :P

Thanks

[kcprawal]

you are awesome man!!!

[DanielKovach]

Thanks to this video I passed my permutation chair & ball test!

[DanielKovach]

I have never understood how to actually add up a number of people sitting in chairs or holding balls into a finite number; I always end up with infinite! But I now understand that people who sit in chairs sit in the balls and therefore N x N x N = N^3

[maverickjb10]

Math ughh but Thanks

[Pr0x1mo]

wow, what are you 5?

[woo216]

thanks man you vids are great

[andortaker]

isnt ermutation$ its variation

[itzoUSA]

Very well explained!

[pzsmcrew]

THANK YOU REALLY MUCH, I have tomorow big math exam, it helped me a lot

[90271Manikandan]

Thanks a lot.

[bluemilklovers]

shit!

[blastergun11]

tats wat u r

[Pr0x1mo]

LMFAO

[DjXa0C]

thx! it helped me very much!

[captainspiwtf]

Chair tree? LOL Nice stuff.

[magnoliasdeacero]

What does this mean? You said:

"If we just cared which of the balls were picked but we didn't care whether they were in cup 1 or cup 2..."

What's the opposite of that?

Thank you.

[GDATERRY]

combinations

[jpcgandre]

210 if only the first person had to sit on the chair 1 and the second on chair 2. if they're independent then there are 1260 possibilities....

[polos505]

probability is everywhere . even in precalc.

[safithegr8]

its ( n - k ) !

not ( n - k ! )

[shazaduh]

keep it up! please continue with stat and prob videos

[mechasentai]

For some reason this has always rattled my brain. This really helps. Thanks!

[Winsunn307]

Thank you so much.

[jaggedscorpion]

thank you!

[Harry0Ron0Hermione]

it's (n-k)! not (n-k!), just a little remark.

[danielkirk1]

@Harry0Ron0Hermione I'm not on to anything or that... But why do you watch stuff you already know?

[Harry0Ron0Hermione]

@danielkirk1 Lol I think that I forgot before...

[yumeybaconcutout]

@danielkirk1 it's kinda common sense.

[danielkirk1]

@yumeybaconcutout Interesting, please continue.

[eldominicanboy]

nice

[dylanVSzach]

sweet, thanks