COMBINATIONS - DISCRETE MATHEMATICS

In this video we introduce the notion of combinations and the "n choose k" operator.

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[sorazietti]

i've literally spent the last 2 weeks crying because i couldn't understand this chapter and after watching this video i finally understand it thank you!

[myersjosh]

I'm loving this series, and am finding it so helpful - thank you! One minor point is that in the lottery example (from memory) your odds is actually the probability (p). The odds = p / 1 - p

[splashdot]

SFU REPRESENT!! ( you were my TA for linguistics)

[alisa]

The last example was amazing! You just know where a person might get confused and you make it clear immediately. Thank you so much

[MultiPahal]

This series has helped understand the entire scenario of these permutations and combinations i couldn't understand for years.

[Trevtutor]

Can't reply to your comment since you don't have it enabled.

You will not have consecutive vowels in the final product. We arrange the vowels, then we chose 5 out of the 7 available positions to put those vowels. xTxLxLxHxSxSx. The vowels will replace 5 out of those 7 x's. We had to arrange the vowels independently so we know how to order them.

[PWskates]

Thanks, dude. I really appreciate your concise explanations to all of these different concepts...got a test in 5 hours...hope I don't fail lol

[obakengmothusi]

This video is 8 years old, and even today u r the best even to this day.
Personally, I do like your voice.

[suvendudeb]

yup now I understand.I have to use principle of product rather than principle of addition to solve it....thanks a lot sir

[shakeel]

This was super helpful and very insightful.
You're a life saver Trev!

[LordRamen]

Im just taking the course just its my last class for my IT degree

I really dont like math but ur vids are helping me though it

[MdMusfiqurRahman-hvdg]

Your channel deserves millions of subs

[budisudarmo]

These are awesome, my teacher gave a similar example as the last example, couldn't understand and doing it on my own before watching this video ❤❤❤

[bakerr]

just keep going with your videos, they are really helpful

[CiscoASR]

You saved me !
I am going to be your biggest advocate...

[Ln_e_]

I was ready to cry because I have an exam in a few days and I couldn't make any sense of the textbook or the examples. Thank you so much for these videos, you're a lifesaver!

[virajrana]

+TrevTutor,
Hey Trev Tutor, I am confused with this problem “what are the odds of winning a lottery where all 6 numbers of chosen out of 49 must be picked to win”? Wouldn’t this be a permutation question since lottery number such 123456 will be different from a lottery number of 654321. So order matters? Thank you for your awesome video!

[TheTehnigga]

Is the last exercise a mixture of combinations and permutations? When we compute how many arrangements we can do with the vowels and the consonants?

[helloimnisha]

Why did I not find you before? PS:Midterms are tomorrow and tonight I will be pullling an all nighter.

[mayadamohsin]

in the last example you made a combination for the vowels letters, but in this case we will have consecutive vowels!! can you explain that further please ? :)