Post by: dekoyl on November 06, 2008, 02:23:58 pm
I saw a few unit 1/2 questions here a few days a go and I didn't know how to do them :(
Post by: trinon on November 06, 2008, 02:25:15 pm
Are things to do withexaminable in units 3/4? I don't think I've had anything to do with it for the whole year and I can't remember how to use it at all.
I saw a few unit 1/2 questions here a few days a go and I didn't know how to do them :(
No. That isn't actually on the 3+4 course and they can't test you on it.
Post by: cobby on November 06, 2008, 02:26:37 pm
Example, in choosing between A,B,C,D & E , how many ways can you choose any 3 arranged letters. (This means ABC is different from ACB or BCA or...)
Then 5P3.
you use nCr , when the order is not important.
Example , how many ways can you get three letters from A,B,C,D & E. (here ABC is no different from BAC since you just got A&B&C.)
Then 5C3
Post by: fredrick on November 06, 2008, 02:28:59 pm
Post by: dekoyl on November 06, 2008, 02:29:57 pm
So stuff like "There are 10 chairs and there are 3 people: Bob, Tim and John. How many ways can they be seated if Tim and John can't sit together?" won't be examined on right?"
Post by: cobby on November 06, 2008, 02:30:40 pm
how would you use nCr to expand stuff like
you use nCr for that ??? :| :| :| :S
Post by: cobby on November 06, 2008, 02:31:53 pm
PHEW. Thanks!
So stuff like "There are 10 chairs and there are 3 people: Bob, Tim and John. How many ways can they be seated if Tim and John can't sit together?" won't be needed right?
what do u mean by "wont be needed?"
Post by: dekoyl on November 06, 2008, 02:35:14 pm
what do u mean by "wont be needed?"Fixed it :P Bad English.
I think I've got it now. Where arrangements matter = won't be tested on.
Post by: cobby on November 06, 2008, 02:37:10 pm
what do u mean by "wont be needed?"Fixed it :P Bad English.
I think I've got it now. Where arrangements matter = won't be tested on.
i doubt it for 3/4 mm,
but i had a probability test y'day for 1/2 and nPr was on there..lucky i knew how to use it *wipes sweat of forehead*
Post by: Mao on November 06, 2008, 04:44:38 pm
Are things to do with
I saw a few unit 1/2 questions here a few days a go and I didn't know how to do them :(
No. That isn't actually on the 3+4 course and they can't test you on it.is however on the course.
nCr is not really on the course either :P the application of pascal's triangle [nCr for lazy people], however, is.
Post by: shinny on November 06, 2008, 04:46:37 pm
Post by: ReVeL on November 06, 2008, 04:51:32 pm
how would you use nCr to expand stuff like
Etc.
Post by: Mao on November 06, 2008, 04:57:25 pm
I thought they've tested stuff from MM1/2 before though? Or is that only very very basic things like venn diagrams and such.
yeah, mostly venn diagrams and very very simple sampling problems... like "if i have a bag of 5 red balls and 3 blue balls, what's the change of me drawing a red and a blue?" [use tree diagram]
Post by: Captain on November 06, 2008, 06:30:54 pm
Someone care to explain it, in context to a question? Thanks.
Post by: dekoyl on November 06, 2008, 06:35:23 pm
Post by: Mao on November 06, 2008, 06:36:08 pm
I really hope nPr isn't on the exam, I've never done it before :/
Someone care to explain it, in context to a question? Thanks.
Post by: Captain on November 06, 2008, 06:49:20 pm
Mao, Get on MSN :P
Fixed
Post by: cobby on November 06, 2008, 06:52:53 pm
(http://i34.tinypic.com/2drvtzl.jpg)
Mao, Get on MSN :P
Fixed
uhh why did u scratch out mao's email when its on his profile? :S
Post by: Captain on November 06, 2008, 06:57:17 pm
uhh why did u scratch out mao's email when its on his profile? :S
Is that important? I had to scratch other things out too, Got a bit carried away.
Post by: AppleXY on November 06, 2008, 07:00:04 pm
Post by: cobby on November 06, 2008, 07:01:44 pm
uhh why did u scratch out mao's email when its on his profile? :S
Is that important? I had to scratch other things out too, Got a bit carried away.
haha nah i just was wondering..but yeh =] bye bye
Post by: midas_touch on November 06, 2008, 07:01:54 pm
Post by: Captain on November 06, 2008, 07:02:29 pm
Woah, MSN has evolved that much?! Holy crap. It makes MSN for Mac a piece of shit. (ok it was always a piece of shit lol)
Off Topic a bit: I'm running Windows Live Messenger 2009 Beta, Yay for bugs.
On topic: Math rules.
Haha, what a /b/tard :P
Mhm, Study or 4chan? I've made my decision :P