wow! after struggling for almost an hour to figure out what in the world my textbook was talking about I just watched this one video and I got it!!!! Thanks so much!!
Yay! Your videos don't suck! You don't sound pretentious (like most Kahn Academy male voices)! Thanks for putting a video out that people can relate to!
Thank you so much for making this video! I was just assigned this homework and needed help. Found a couple of vidz that assisted me a little, but not like this one. This made it so easy to understand and really get a feel for why you would even use this kind of stuff. Well, continue with the great vidz, you helped me so much!
This video is amazing - very well done! The examples you choose caught my interest, and I really enjoyed how you were able to take the a scenario and make different problems out of it. And you explained everything so well! Unlike most permutation videos I have seen, this one did not bore me. Great job, and I look forward to seeing more videos from you :)
A truly good explanation of the concept of a permutation.One's understanding is increased dramatically when the concept is applied to a "real" situation.
Very helpful and the examples are very apt. Thanks for all your head work. It was very difficult for me to understand while I was doing my graduation. So I skipped probability chapter and learned all other chapters in my business statistics. I wish if I would have seen this video during my graduation time.
Thanks, I just made brute force password algorithm with your formula, not only that I was able to customize it for my language since I understood the formula. Thanks for the cheese!
Hmm... aren't you confusing the terms? I thought that combination locks use... well... COMBINATIONS, not permutations, because one can choose the same item for each position (i.e. the digits can be reused), and I thought that permutations are about shuffling a set (i.e. the number of possible rearrangements, and since an item can only change its position, but it cannot be "cloned", it cannot occur more than once at multiple positions). Has the terminology changed since I last learnt about it or you made a mistake?
+Bon Bon no, he was right. You see, some permutations allow repetition of items (in this case, numbers) and some don't. Combination locks do, ironically, use permutaions. In other cases, items can't repeat (as in the case with the runners, since each runner can only be chosen once). Combinations, on the other hand, are when the order in which the items is chosen doesn't matter at all. The order of the numbers on a lock matters, so its a permutaion not a combination. The order in which racers finish (1st, 2nd or 3rd) matters, so its a permutation not a combination. Hope this clears things up a bit! If combinations are still confusing, he did a separate video on them.
Rosseriah Well, then perhaps this is one of these "America vs. the rest of the world" things, because what he shows in the next video, is called "choose" here where I live, and it is related to the binomial theorem. Combination locks use... well.. "combinations", and the term "permutation" is reserved only to shuffling a set of items (and possibly choosing a subset afterwards, in which case it is then called "variation"). Similarly, we write "ln" for natural logarithms and "log" for logarithms in general, while Wolfram Alpha seems to use "log" for the natural logarithm.
+kolumath When I was young, we were learning polynomials and differentiation in high school. Now when I'm older and when I ask some of the youngsters what are they learning in their schools, it makes me sad :( They don't even learn about solving quadratic equations anymore :/
I was listening the explanation with the speaker on (and there are more people around) and all the sudden that loud weird voice in 10:06 was soooo embarrassing.
wow! after struggling for almost an hour to figure out what in the world my textbook was talking about I just watched this one video and I got it!!!! Thanks so much!!
I've been searching through a gazillion permutations videos and this is the ONLY one that makes sense. Ties is all together. Indebted to you!
Yay! Your videos don't suck! You don't sound pretentious (like most Kahn Academy male voices)! Thanks for putting a video out that people can relate to!
Thank you so much for making this video! I was just assigned this homework and needed help. Found a couple of vidz that assisted me a little, but not like this one. This made it so easy to understand and really get a feel for why you would even use this kind of stuff. Well, continue with the great vidz, you helped me so much!
This video is amazing - very well done! The examples you choose caught my interest, and I really enjoyed how you were able to take the a scenario and make different problems out of it. And you explained everything so well! Unlike most permutation videos I have seen, this one did not bore me. Great job, and I look forward to seeing more videos from you :)
Now it makes sense, thank you for making this simpler and very interesting to learn.
A truly good explanation of the concept of a permutation.One's understanding is increased dramatically when the concept is applied to a "real" situation.
This is a great introduction for my class. Thank you!!
Please come teach at my school and at every school ever. You are awesome and I love you. Keep doing these videos!
Very helpful and the examples are very apt. Thanks for all your head work. It was very difficult for me to understand while I was doing my graduation. So I skipped probability chapter and learned all other chapters in my business statistics. I wish if I would have seen this video during my graduation time.
Brilliant explanation for highlighting difference between counting and permutation applications.
Thanks, I just made brute force password algorithm with your formula, not only that I was able to customize it for my language since I understood the formula. Thanks for the cheese!
Really, you did me a HUGE favor by breaking it down like that. Are you going to do any more videos?
Amazing video. Beautiful visuals. Thanks a lot for the hard work.
The way you explained it is amazing!
Clarity at last!!! thank you
Great explanations! I learned a lot :)
fantastic and fun videos. keep up the excellent work!!
Second lock has less combinations, because you can not use the same number twice in a row. It has to be different equation.
You are a saint.
Very Nice and Explaining way is awesome,,,
Very well explained and illustrated. Keep doing these videos. :)
Thank you, Taking a biostatistics class and this made it click. By the way love the Pee Wee Herman Bike! HA HA...Heh heh heh.
Mate, that was a fantastic job. Keep these videos coming. Peace.
You're awesome! Thank you :)
Excellent!
how many 4-digits even numbers can be formed using digits,1,2,3,5 using each digit once? kindly reply
You are brilliant👏
Hmm... aren't you confusing the terms? I thought that combination locks use... well... COMBINATIONS, not permutations, because one can choose the same item for each position (i.e. the digits can be reused), and I thought that permutations are about shuffling a set (i.e. the number of possible rearrangements, and since an item can only change its position, but it cannot be "cloned", it cannot occur more than once at multiple positions). Has the terminology changed since I last learnt about it or you made a mistake?
+Bon Bon no, he was right. You see, some permutations allow repetition of items (in this case, numbers) and some don't. Combination locks do, ironically, use permutaions. In other cases, items can't repeat (as in the case with the runners, since each runner can only be chosen once). Combinations, on the other hand, are when the order in which the items is chosen doesn't matter at all. The order of the numbers on a lock matters, so its a permutaion not a combination. The order in which racers finish (1st, 2nd or 3rd) matters, so its a permutation not a combination. Hope this clears things up a bit! If combinations are still confusing, he did a separate video on them.
Rosseriah Well, then perhaps this is one of these "America vs. the rest of the world" things, because what he shows in the next video, is called "choose" here where I live, and it is related to the binomial theorem. Combination locks use... well.. "combinations", and the term "permutation" is reserved only to shuffling a set of items (and possibly choosing a subset afterwards, in which case it is then called "variation").
Similarly, we write "ln" for natural logarithms and "log" for logarithms in general, while Wolfram Alpha seems to use "log" for the natural logarithm.
Merci
Thank you 10^10!!!!!!!!!!!!!!!
A simpler formula for lock's permutation could be n^r
Is this stuff being covered in American high schools?
John Fletcher It was when i was teaching (five years ago)
+John Fletcher yeah. We're doing it in freshman year.
+kolumath When I was young, we were learning polynomials and differentiation in high school. Now when I'm older and when I ask some of the youngsters what are they learning in their schools, it makes me sad :( They don't even learn about solving quadratic equations anymore :/
Trés bon
i dind it easier to go for a lock with 0-8 digits and 5 rows, 8^5
Cool, TIL that there is a higher probability to get 1st position than 3rd position.
great
Make more videos please
nice
I love you.
Nice video bruhhhhhh on dogs yo I like cheese keep it up fammmm
I was listening the explanation with the speaker on (and there are more people around) and all the sudden that loud weird voice in 10:06 was soooo embarrassing.
sir in daily life for example
Love the Pee-Wee bicycle !
great at 13:20
but we have 11 racers, not 9.
Wow.. I struggled and a after this video I just lost 15 minutes.. nice...maybe I am dumb and can't understand anything.