EVERYTHING about Permutations & Combinations | A Level Math Topical Series (2024)
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🔴 About This Video 🔴
By popular demand, this is a video on everything you need to know about Permutations & Combinations. We'll cover the basics of Permutations and Combinations, how to use the insertion method, as well as finding permutations in a circle. It is currently just the basics, but as we delve into more questions, we would see greater how the concepts here can be applied to those questions.
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@vaibhavmaloo7909 3 жыл бұрын
This is by far the best permutation video I've watched.
@arminsgf5731 2 жыл бұрын
this was a really helpful video; thank you so much! :)
@KeiVC 4 жыл бұрын
ah my nemesis lol thanks for this haha
@asraamir0 6 ай бұрын
Love the lecture ❤ first time understanding online
@praisemugodi4733 3 жыл бұрын
Thank you☆
@maryamjaved3519 3 жыл бұрын
Tahnkyouuuu💕
@sarahatwiine5552 3 жыл бұрын
thanks so much .....but i would like to get some qns about the topic for practice
@hillarychivavava 5 ай бұрын
Good explanation 👏 👍
@michellesilva8220 3 жыл бұрын
great video!in 8:23 we also could use the method 10P5 too right? just to make it sure>
@levupeducation 3 жыл бұрын
Yes, absolutely!
@evridden546 2 жыл бұрын
Hi for the insertion method is it not possible to insert them at the extreme right and left? Since they will not be standing beside each other. Would it be 8C2 instead of 6C2?
@dania1883 4 ай бұрын
Yup I totally agree with this oneee , this is how I learnt at school. And in total there’s 9 people , 7 can sit with each other (that’s why we permutate 7!) 2 cannot sit with each other (that’s why we do 8C2 x 2!
@SangitaKumari-px7zv 3 жыл бұрын
Hey ! ! Can you tell me what do you mean by r that you specified
@redcyrusff4034 3 жыл бұрын
The number of items chosen from the total number or items available.
@itsbossin 3 жыл бұрын
I have a question, in (18:14) so basically you multiplied (7!) x (6C2) x (2!) and that would be the answer? Thanks for the great content!!!
@levupeducation 3 жыл бұрын
Yes, correct.
@user-rv1gv9pl8u 3 жыл бұрын
@@levupeducation Hi should it not be 8C2 x 2! cuz you did not include slotting it before A and after G
@wozahslampers8266 2 жыл бұрын
@@user-rv1gv9pl8u I'm assuming it had to be within the extreme boundaries and not outside them
@kaienglei 2 жыл бұрын
I would like to ask a question! Hope you could answer me~ 4 different red balls and 5 different blue balls are placed in a row in a container with 9 partitions. Find the number of ways of arranging them if a) the red balls and blue balls are placed alternately b) no red balls are placed next to each other
@alvinkhoo2193 2 жыл бұрын
(a) 4! x 5! , the arrangement of the ball can only be b1, r2 , b3, r4 , b5 , r6 ,b7 ,r8 , b9 so we are just calculating the different possibilities of arrangement of the four red colour balls in their red balls position and the same for the blue one . (b) ( 4! x 5! ) x 2 , the first arrangement of the four red balls can be done by putting them at the 1st , 3rd , 5th , 7th partitions , and then the second type of arrangement of the red balls is by putting them at the 2nd , 4th , 6th , and 8th , and if I'm not mistaken , R1R3R5R7 are just the same as R3R5R7R9 , but I'm not sure about it though , you better check the answers to confirm this
@kaienglei 2 жыл бұрын
@@alvinkhoo2193 Thx a lot!!
@crewmatewillthrowthesehand7600 2 жыл бұрын
For identical objects, what if I only Take 3 out of 6, then how to solve?
@auroraofstars 2 жыл бұрын
3P6 divide by (the number of identical object A)! x (the number of identical objects B)! x … x (the number of identical object N)!
@agapephele2124 Жыл бұрын
Hey, you never talked about if items in a row a being permutated and a pair a placed next to each other how you work around it
@agapephele2124 Жыл бұрын
Basically attachments with restrictions
@agapephele2124 Жыл бұрын
Arrangements ^
@angelinoz5159 3 жыл бұрын
I am struggling with one question, can you help: There are 10 seats in a row in a cinema theater. 6 people are shown to this row and two of them must sit together next to each other. In how many different ways can they be seated? According to me it should be 2 seats taken by the couple leaves 8 seats for the 4 people. the first person has 8 options, the second has 7 , then 6 and then 5. The other two have 10 and 9. I am confused. Please reply
@levupeducation 3 жыл бұрын
So firstly you must group the couple together (the 2 of them) -> Because they now take up "1 seat", you can permutate them 9 times out of the 10 original seats. After which, they can both exchange positions so you permutate the 2 of them. Next, you have the remaining 4 of them and with the remaining 8 seats, so permutate the 4 of them out of the 8 seats (8 choose 4 then multiply 4!). Add everything and you should be good to go.
@angelinoz5159 3 жыл бұрын
@@levupeducation So if my understanding is correct, 9!x2!= 725760, the second part is 8C4x4!= 1680. Now if we add up both values we get 727440. But the answer in the book is 30240. I still don't get it.
@levupeducation 3 жыл бұрын
Can you send the question to my email? alevellessons@gmail.com
@KeshneeSurendran 3 жыл бұрын
@@angelinoz5159 Since 2 seats have been taken up by the couple and no matter where they sit they have to be together, you can treat the 2 people as 1 person. Now with this logic, only 1 seat has been taken up. Now there are 9 seats left, 4 individual people and 1 couple (taken as 1 person) to be arranged among these 9 seats. Therefore its 9P5 = 15120. Since the 2 people can exchange positions, you permutate the 2 of them (2!). Therefore the answer is 9P5*2!=30240 :)
@KeshneeSurendran 3 жыл бұрын
It becomes easy if you forget the couple and consider it as one person, hope this helps :)
@wozahslampers8266 2 жыл бұрын
I don't understand the circle one
@niharikamanandhar1895 2 жыл бұрын
are u singaporean ?? istg u sound just like my singaporean friend!
@levupeducation 2 жыл бұрын
Yes I am! But i don't think i am your friend hahaha ;)
@abdallalotfy3923 3 жыл бұрын
did not understand a single thing from permutations !
@levupeducation 3 жыл бұрын
Hope this video clarified some doubts !
@faithelias2798 2 жыл бұрын
God loves you and he wants to save everyone, but in order for him to do that, you need to repent and be baptized. Also share his gospel with everyone you come in to contact with and keep his commandments 🙏🏾😘
@botdemonitisation2527 Жыл бұрын
who fucking asked
@editsofstuffilike._9406 8 ай бұрын
@@botdemonitisation2527Jesus loves you
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