SAT Math Question #6

[boy29girl]

help!!!! i can't figure out where did you get 3(factorial)

[chinotovar]

@boy29girl he said it. take the difference (5 - 2 = 3) another example is 8 C 3 (8 - 3 = 5)

[purpleleach1]

Umm.. wow I can't count, 800+600+600 is 2000.

[nicole2cool1]

im taking my sat on october 1 and im so scared because i look at some of these questions and i don't remember almost nay of it.. and i need to get at least a 1270 on it to get my scholarship... what is a good studying method?

[patrickJMT]

@nicole2cool1 take practice tests. take some more practice tests. study those sections that give you difficulty. do some more problems. take some more practice tests. and for the love of god, do not wait until the week before the exam before you start doing this. hopefully you started studying over the summer break if it is so important for you.

[nicole2cool1]

@patrickJMT yeah im studying a lot, its just my counseler thought it was good to just sign me up a month before the exam and not knowing till the other day, she wants to see how i do without prepclasses, but at the same time i really want to pass something lol

[purpleleach1]

@nicole2cool1 HI NICOLE! I'm taking the SAT the same day as you are! My goal is a little bit higher than yours and I'll tell you I'm just as scared! Lol. My aim is pretty much a 2200 on the SAT and a 800 on the SAT math. This is pretty much a requirement to getting into MIT (not really but statistically).

[purpleleach1]

@nicole2cool1 800 math, 600 critical reading, 600 writing in other words is my goal. That would be 1400 if you count math & critical reading.

[r0met0talwar]

just a comment...wouldnt it have been easier to just multiply the 5*2 for the guitarists instead of going into facotrials and such?

[xFiasco33]

@r0met0talwar This just happened to be a coincidence. 5 C 2 = 10, but for example, 6 C 2 = 15, which is not equal to 6*2 = 12. If you think about it has 5*2, then unless you get this same example on a test, you will most likely get the answer wrong.

[ActorFlautista]

Instead of using Combinations, can't you just multiply 5X2 instead of finding the factorials in most common case scenarios?

[chinotovar]

@ActorFlautista NOin this case it just coincide but u cant multiply 5 time 2 u have to use the combination formula. for example 8 C 2 is not equal to 16, the real answer is 28

[salvihilton94]

for this, honestly, my math teacher would have said do 2(5) x 2 x 4 = 80.

[SlushieGuy]

My brain is too undeveloped to comprehend this Q_Q

when i read the question i was like

k so obviously the answer is 2 cause theres not enough people for 3 groups

then i looked at the possible answers

me: ._. i'm dumb..

[dajakesta1234]

can u tell me wut aMN is???

[Hectorious2222]

Hey could you have just multiplied 2 guitarist by the # the person can choose from? 5X2=10?

[locatostada]

you made it all complicated xD all you had to do was 5x2= 10 times x2 x4= 80 doing all the factorial part for nothing because or coure 2x1= 2 and 4x1 =4 so yea ... just saying....

[Mattaboogum]

@locatostada Gotta be careful with this though. It could have been a permutation.

[fuzycatterpiller]

I think you over complicated this problem. Couldnt you just begin with multiplying the 2 by the 5 to get 10*2*4 which still equals 80? Or is that just a coincidence?

[salvihilton94]

@fuzycatterpiller you're correct! my math teacher does it the same exact way. it's not a coincidence, it's a little different if it's without replacement or with.

[strangelybrown2003]

I'm so glad we don't hae bullshit questions and tests like this in the UK

[p0g1ng]

@strangelybrown2003

so, what kind of DOGSHIT questions do you have there in UK? could you share at least one?

[p0g1ng]

@strangelybrown2003

so, what kind of dogshit questions do you have there in UK? could you share at least one?

[p0g1ng]

@strangelybrown2003

so, what kind of dogshit questions do you have there in UK? could you share at least one?

[slhsball]

ILY no homo... but what the hell is a factorial =D. Excuse the french

[MasterofLyricz]

u could also use combinations

[nintendo768]

you could have multiplied 2 guitarist you could choose from with the numebr avaliable

[eceeryavuz]

holy shit this is like 4th grade mathematiques in my country! LOL

I forgot these shit. now we do stuff that dont require mind

[ScarFace9797]

@eceeryavuz  yea ok.

[bleach4life101]

I guess you also "do stuff" that makes your grammar atrocious?

[uzbsegausa]

:D nvm i got it :)

[uzbsegausa]

thank you...i have one question...where u got 2x4

[piiigrrl898]

Around 1:38-1:49

(Number of bassists & drummers the girl can choose from)

[dontgomonkey]

lolz im from canada and our questions are way harder. i havent taken math for a year now and i still got this one.

[GraphicDude101]

easier way:

2x5x4x2=80

[FEARcactus]

SATs are easy...

[lydrine]

this is amazing

I have learned a lot tonight

you make things way easier

thank you sir!

[marcusjhung]

i remember doing this, the calculator approach makes it so much less of a hassle!

[kim443]

U make things easier thanks!... I appreciare it alot =)

[patrickJMT]

my pleasure : )

[jadin67]

sir, I'd like to ask what factorial is....thanks!

[patrickJMT]

you can see my video on factorials : )

[jadin67]

i see...thanks!

[themillenia]

OR,you could just use the nCr button on a calculator.

[patrickJMT]

i prefer to use my brain

[lee155912000]

@themillenia Calculators are what make kids lazy!

[kbt1993]

men u really make this seem simple/....

how can i improve jotting down the problem like u do?

any suggestions?

[Slaught1004]

can u do another one to make sure

that i actualy i actually got it!

[olsome2]

since it says 2 from 5, 1 from 4 and one from 2, couldn't you simply use the multiplication principle, as you speculated and say 10(from two guitarists times 5), 4, and 2. Then, you would have had 80

[Ibrahimshaban619]

Nice, it would be better if you post more videos

[amak1131]

Simple, but a very nice review. Years since I had to use Permutations/Combinations and was nice to have a refresher. Teaching technique is one my Math Analysis teacher sort of used and it works very well:)