In behalf of all the people cramming for their finals right now, thank you!
@Clammychow
6 жыл бұрын
And here I am, three years later. My final's tomorrow XD
@avory7938
3 жыл бұрын
@@Clammychow and here I am, 3 years later. My final's tomorrow xD
@radd4255
Жыл бұрын
@@avory7938 Here I am, a year later. My final is tomorrow.
@yamboyasmr4779
Жыл бұрын
@@radd4255 I'm here a month later finals tmr
@ivanmartincampoy
Жыл бұрын
@@yamboyasmr4779 i'm here a month later as well
@EricaMorgan
8 жыл бұрын
Whhhhhyyyy doesn't my genetics professor teach it this way??? the formula is so confusing, but the way you explained it I understood it and it's so easy!
@socaljusticewarrior558
5 жыл бұрын
Because your genetics teacher isn't an attractive math man
@user-lb4mf6hx5u
6 жыл бұрын
My statistics professor is someone who explains things for people who already know about the topic. There are variables everywhere which are not explained. Thank you for making this video, it showed me how simple this actually is and how fun the topic can be.
@esperar1
12 жыл бұрын
This is currently the clearest video I've found on permutations. It actually explains the concept behind the equation, which will stay in my understanding far beyond the memory of the equation. Thanks!
@adamdintelman2067
7 жыл бұрын
Holy shit, this guy does everything! I mean seriously, what can'd he do?
@dboijahskush1251
7 жыл бұрын
hes a alien here to help us not destroy ourselves
@amanrubey
7 жыл бұрын
he's an mitian
@atriyakhan8535
6 жыл бұрын
Adam Dintelman ikr!
@suneelnadipalli2685
6 жыл бұрын
Teach badly
@socaljusticewarrior558
5 жыл бұрын
He can't fail
@Tosserke
12 жыл бұрын
I use these videos for my exams at university, just love this. It's no drama if I skip a class, this is taught even better
@maitrigandhi51
7 жыл бұрын
This is so EASY. I have an exam tomorrow and I'm relying on this video for 5 marks! Extremely helpful!!
@clockfixer5049
4 жыл бұрын
Maitri Gandhi how it went?
@acatindisguise
8 жыл бұрын
you explained it better than the lecturer at school. thanks for this video :)
@TechLord79
9 жыл бұрын
Thank you very much, when I learned that at school back then they went over it too fast and I could not get the reasoning behind the formulas. I see clearly now, well presented :-)
@rahafhesham3262
3 жыл бұрын
me in 2020 tryna understand this topic cause online school doesn't help
@farenkofi
8 жыл бұрын
I am very grateful for the explanation and logical reasoning. The basic concept is what i really needed and that it something i didn't have while doing additional math for IGCSE. I'm happy nonetheless I have understood in A level statistics. Thank you.
@thelamp091
2 жыл бұрын
It is a video from many years before bir it's still very helpul. Thank you so much!
@aerismagia8058
8 жыл бұрын
I would like to see Sal teach electrical engineering.
@AishLovesSpaghetti
4 жыл бұрын
You explained everything very cleary using easy practical examples. Keep up the good work!
@moneychica
12 жыл бұрын
THANKS! These are great tutorials, I'm currently doing online schooling and my cousin just recommended you.
@LAnonHubbard
13 жыл бұрын
Good explanation. I've always found this sort of thing confusing but this video was very clear. Great intuition gained.
@balsyitlog
11 жыл бұрын
Thank you khan for always bringing me one step closer to smartness.
@ozzyfromspace
5 жыл бұрын
Wig snatched. Thanks Sal, I needed this refresher (found an application for it in my research so many years later lol).
@samanthamanego2923
7 жыл бұрын
Been sitting in a chair for 2 hours, but I've never understood it. Now, 10 minutes and I have understood at least a tinsy bit.
@mariapineyrua5405
7 жыл бұрын
you are the best! i been using your videos since I was in remedial at college, know I'm in my last year of the university. doing qmb. you should be a professor! thanks
@heldan898
10 жыл бұрын
3 balls, 2 cups
@ronroyes2375
7 жыл бұрын
I usually don't understand his vids, but he taught this so easily... even I could grasp the concept this time 😅
@aditishikha8149
3 жыл бұрын
Great work sir. Thanks for making me understand this thing so easily.
@levizraelit5557
10 жыл бұрын
Thank you so much. I've spent an entire day trying to understand this from the textbook with no success.
@Mslokalove
9 жыл бұрын
You're a life saver!!❤❤❤
@seemade4432
6 жыл бұрын
In India permutations is taught in class 11 & 12 but due to this awesome guy I understood the topic even after being in class 9 . Thanks Sal
@shashankpandey1966
2 жыл бұрын
are you in state board ?
@jugsmcflugs4954
7 жыл бұрын
I learn more from this than my geometry teacher
@aaaasssskkk11111
12 жыл бұрын
THANK YOU THANK YOU THANK YOU!!!!! I have a probability test next peroid, and didn't get it until I watched this!!!!!
@legendinbusiness2022
7 жыл бұрын
Thanx khan academy for making the impossible possible coz i am just studying in9th standard and i need to write an olympiad based on 16 chapters which includes combinations and permutations. And now may be i will achieve a good rank in it.
@anshikakushwaha3150
6 жыл бұрын
2018!? Time flies fast. 2008 passed 10 years back!
@nocturnalvisionmusic
Жыл бұрын
Now August 2022 😌🥳
@nocturnalvisionmusic
8 ай бұрын
Now end of November 2023. 😌🙏
@Death_User666
7 жыл бұрын
i am in college and i am learning this all on my own thanks to this guy
@frankthetank1285
14 жыл бұрын
Thanks, your videos are always great!
@scoldingMime
11 жыл бұрын
"And I want to know, how many different ways can I put these 3 balls into these 2 cups?" Call me immature, but I started chuckling. Aside from that, this was very informative.
@abdsha777
Жыл бұрын
Wow this style of teaching is soo good
@Diegoangola1
8 жыл бұрын
Thank You, actually i had a Pre-Algebra book and i couldnt understand it, but with the video i could
@abhishekravindra4008
5 жыл бұрын
I got intuitive blast after watching this it made so much sense looking at the angle from that you want the first k terms of the n! Then its almost common sense that you want to cancel out the left terms so you are doing (n-k)! To cancel them (n-k) is number left from n after occupying n spots
@ThomasMendenhall
11 жыл бұрын
You are the reason I survived 6th grade. thanks for making these videos.
@Swiizzey
8 жыл бұрын
7:58 I feel bad for people watching this on mobile and not being able to see the annotation correction and get really confused
@eliaskountouris4214
7 жыл бұрын
Swiizzey what I'm on mobile pls help
@jugsmcflugs4954
7 жыл бұрын
Elias kountouris equation is supposed to be n!/(n-k)!
@advaitpai1615
6 жыл бұрын
DeformedBear who the hell allows phones into examination halls
@suneelnadipalli2685
6 жыл бұрын
Sal wrote n!/(n-k!) It's supposed to be n!/(n-k)!
@troyawaneedavisd
6 жыл бұрын
Swiizzey And I certainly did get confused!! Thumbs down for me!!
@sureshchaudhari4465
4 жыл бұрын
Hi I was very weak in maths I wish internet was super cheap in my academic years I would have got better marks and understanding about maths concepts.Thanks Khan Academy
@bagitandbinit
12 жыл бұрын
this video is such a great help, thank you
@aal2002
5 жыл бұрын
Thank you for making this so understandable!
@dennisphieros7266
10 жыл бұрын
Khan Academy rules...
@littleconch
9 жыл бұрын
Oh my god thank you so much our teacher has literally taught us nothing about this and has told us to research it for our assignment this helped so much
@ucHorrible
9 жыл бұрын
Mine did, too! It was the last lesson in the chapter, too xD
@ucHorrible
8 жыл бұрын
***** 8
@littleconch
8 жыл бұрын
HermitOfTheFragshack Oh you poor soul I'm in grade 10
@Diegoangola1
8 жыл бұрын
+HermitOfTheFragshack me too
@somber_soul
12 жыл бұрын
@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.
@const71
4 ай бұрын
great explanation ... a good analogy might be scrabble tiles on the rack played on the board squares...
@SuPeRm4n100
14 жыл бұрын
idk how you know so much...thanks alot man!! :) really helped
@escodrumer
11 жыл бұрын
Great video!! keep it up... better than my math teacher
@TheDailyCat101
11 жыл бұрын
Thank You your videos are awesome for online school.
@shekelboi
Жыл бұрын
For others viewing the video: at 8:00 please note that the factorial symbol should be outside the parenthesis: n!/(n-k)!
@aminaharis4384
4 жыл бұрын
You save my life thank you so much really
@harshgog8212
12 жыл бұрын
Thankss KA!! gosh ur the bestt!! i totally understand this now!!
@medo5101
9 жыл бұрын
Wonderful Explanation !
@scaredyghosts
6 жыл бұрын
I just found a link of his KZitem channel in my textbook...I mean I love videos so I got curious. And I don't regret I did that.
@satisfiction
7 жыл бұрын
So in Braille there are 6 spaces... how many unique characters are there then? Because space 1 and space 2 being filled is the same as space 2 and space 1. Would it just be binary then? 2^6?
@rianarang5207
7 жыл бұрын
This helped me a lot!
@itzoUSA
15 жыл бұрын
Very well explained!
@doratan8463
8 жыл бұрын
Thank you for your video!
@1337w0n
11 жыл бұрын
Its a drawing pad. You'll also need screen recording software, video editing software, and voice recording software. And a mike. I'm not sure if that software should come with either the mike or the pad.
@malbagashi
11 жыл бұрын
Thankyou sir I really respecte what you for us Teens and Kids
@aimenwaseem7854
10 жыл бұрын
omg thank you so much i might just pass my public exam with this (":
@junkheadrooster
12 жыл бұрын
oh thank you. real kind of u mr. old guy.
@bhyll2489
11 жыл бұрын
this guys lessons are awesome
@TORAH4TEENS
4 жыл бұрын
Yeah dey ma be techen stu nonsence
@woo216
15 жыл бұрын
thanks man you vids are great
@gamerstormz67
12 жыл бұрын
@ninjaturtle205 lol a brown ball n yello ball too and he puts them on the cups!
@Technikplayzzz
8 ай бұрын
thanks Khan your vid's help so much ☺☺☺
@gwyneabundo5423
6 жыл бұрын
This helped me allot!
@pzsmcrew
15 жыл бұрын
THANK YOU REALLY MUCH, I have tomorow big math exam, it helped me a lot
@lastnamefirstname8954
3 жыл бұрын
So , how was the exam?
@amirisma7972
2 жыл бұрын
the quality of the video is amazing
@valsastephen9054
8 жыл бұрын
Reason for multiplying eg you want to go from A --B--C,with three possible routes to B and from B 4 ways to C.for every route to b there are 4 ways to C.total =3*4=12 ways for A to C
@DjXa0C
15 жыл бұрын
thx! it helped me very much!
@rtoriq
11 жыл бұрын
i'm with you 100%, bc it irritates me how NO ONE, not even textbooks explain how you just up and multiply. The reason you multiply is just think of what multiplication represents: groups. 7x6 means 7 groups of 6 (or 6 groups of 7). That gives you 42, either way. 3 groups of 2 (or 2 groups of 3) give you 6. Well, if you have say, 4 balls (A, B, C, D) and 3 cups, for your FIRST choice of A, there's 6 ways -6 groups of choices- to fill the 3 cups IF you're starting your choice with A....
@axelthefuccboi764
7 жыл бұрын
I'm doing this in 7th grade SOO... This is REALLY helpful
@farouku5334
4 жыл бұрын
old but gold
@madhuc52
4 жыл бұрын
I look at this in a much simpler way as below " 3 chairs and 7 people" First spot could be fitted in 7 different way or people in this case. For this 7 different ways of first position there will be 6 different way remaining 6 people can occupy hence 7*6 ways two chair get filled, now again third chair has 5 left over people from each outcome (7*6 total outcomes ). So these 5 will occupy in 5 different way with total outcome of first two chair i.e (7*6)*5. If one more chair is there again we have 4 different ways remaing 4 can be associated with this all possible outcome. By THE WAY mathes is too difficult to explain or visualise through words. Happy learning.
@loverofbeats
13 жыл бұрын
please do combinations with repetition! it would be greatly appreciated! :D
@IGzzyderWhizzy
11 жыл бұрын
There are 7 ways of selecting the first person to sit, and FOR EACH way out of the 7 ways, there are 6 ways of selecting the second person. Thus far there 7 * 6 ( = 42) ways of selecting the first two persons and sitting them. Again FOR EACH of the 42 possible ways of selecting the first two persons, there are 5 choices for the third sitter. Eventually we have 42 * 5 ways of selecting 3 out of 7 persons to sit.
@just4anything
11 жыл бұрын
1337wOn, what brand of drawing pad do you recommend. Thank you
@Ryoroyzu
14 жыл бұрын
@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".
@anandsivadoss
11 жыл бұрын
Quality is a concern over here when you watch online. But if you download the same & watch it with VLC player, clarity is superb...:)
@shazaduh
15 жыл бұрын
keep it up! please continue with stat and prob videos
@abidnoushad2883
5 жыл бұрын
Thank you 👍
@raees2046
8 жыл бұрын
how many four digit no with diff digit can be formed if unit and thousands digit must be prime?
@kokonnichiwa
8 жыл бұрын
thank you, i understand more now.
@mohitshresthanep
11 жыл бұрын
Thanks for the subtitles, kid.
@drevil37373
11 жыл бұрын
what if k is greator that n, would it just be k! ? for example you are given 22 poeple 23 seats, there are 23! possibilities cause you have to factor in the situation of each time one of the seats is empty but if you had 2 or more would it stay the same or no? because tech the first and the second empty seat would be both equal seats but the 24th seat could still be sat in i just dont know.
@anjalidutta8471
6 жыл бұрын
Hey, I think you should put that factorial sign of k outside the braces in 8:04
@robertbutcher222
8 жыл бұрын
In the first example with the 3 chairs why would we use npr? Npr is for when order manners. How does order manner here???
@NASIMBINJASIM
12 жыл бұрын
thank you . @khanacademy
@diper07
12 жыл бұрын
Please Someone tell me the Logic of multiplying ..In that balls example how do we get no. of arrangements (permutations) by just multiplying the no. of balls which will go into cups? why it gives us no. of arragements by 2 x 3 ?
@jermam2010
7 жыл бұрын
What if you have just one chair and you can only fit like 4 people? Need help on this
@cherrylouvillas6769
5 жыл бұрын
I'm here in preparation for my licensure examination.😆
@diper07
11 жыл бұрын
You are awesome! :D
@just4anything
12 жыл бұрын
Could you assist me how could I do a video as above? Including the gadgets need to record this video especially the type of gadgets needed to write like what you wrote. Tq
@shishirdixit5996
5 жыл бұрын
Out of 18 points in a plane, no three are in a straight line except 5 which are collinear. How many straight lines can be formed & how many triangles can be formed? Sir why do we need to subtract 5c3 from 18c3 in case of triangles
@captainspiwtf
15 жыл бұрын
Chair tree? LOL Nice stuff.
@ZelForShort
7 жыл бұрын
So if u have 7 traits, and 2 alleles/ possibilities for each trait. to calculate the possible combinations for 7 traits you would have 14 different traits/people. So your trying to seat 14 different people in 7 chairs/traits so? 14 x 13 x 12 x 11 x 10 x 9 x 8?
@ralpharances
7 жыл бұрын
what do you mean by w/o restriction? example?
@marianfrac1569
8 жыл бұрын
how many 4-digit numbers can be formed from the digits 1,3,5,6,7,8 & 9 if no repetition is allowed? help pls
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