Revolution Now!
Welcome,
Guest
. Please
login
or
register
.
Have you missed your
activation email
?
1 Hour
1 Day
1 Week
1 Month
Forever
Login with username, password and session length.
News:
New servers, hooraaaay! More bandwidth, more power.
Home
Help
Calendar
Login
Register
IGCSE/GCSE/O & A Level/IB/University Student Forum
»
Qualification
»
IGCSE/ GCSE
»
Subject Doubts
»
Math
»
Math help !
« previous
next »
Print
Pages: [
1
]
Go Down
Author
Topic: Math help ! (Read 1495 times)
Ghost Of Highbury
O_o_O lala!
SF Farseer
Posts: 4096
Reputation: 41428
Gender:
Namaskaram!
Math help !
«
on:
May 17, 2009, 01:50:15 pm »
Hello all..
i'm stuck in 2008 oct/nov math paper 4 q 9)a)
i am not able to fin "r"
plz find attached paper
thank you
Logged
divine intervention!
Ghost Of Highbury
O_o_O lala!
SF Farseer
Posts: 4096
Reputation: 41428
Gender:
Namaskaram!
Re: Math help !
«
Reply #1 on:
May 17, 2009, 01:54:00 pm »
is anyone dere??
Logged
divine intervention!
astarmathsandphysics
SF Overlord
Posts: 11271
Reputation: 65534
Gender:
Free the exam papers!
Re: Math help !
«
Reply #2 on:
May 17, 2009, 02:01:42 pm »
Am not home until late. He someone else tries good
Logged
X Abdulrahman X
SF Farseer
Posts: 4981
Reputation: 3826
Gender:
Re: Math help !
«
Reply #3 on:
May 17, 2009, 02:03:09 pm »
notice at the top is says "100 students"
if u get p and q, u add up all the numbers inside the circles which should add up to 99, add 1 lonely guy left
Logged
When they talk about me they say I be trippin
What they say about me doesn't make me mad
I think they hatin cause they see me when I'm rollin
Man I can't help it that they really doin bad =P
Big cars, Big wheels, Big chains, Big pimpin', Big money, Big Dreams ;-)
Enia
SF Immigrant
Posts: 105
Reputation: 32
Gender:
Re: Math help !
«
Reply #4 on:
May 17, 2009, 02:07:14 pm »
for p you have to add 12+17+8 you get 37. subtract that from 42 (because they said 42 students like swimming)
Then they said 40 people like only ONE sport that means you add 20+8 (28) and subtract from 40
for r add everything in the circles (u get 99) than means only one person doesn't like any sports.
Logged
joel
SF Immigrant
Posts: 74
Reputation: 609
Re: Math help !
«
Reply #5 on:
May 17, 2009, 02:15:47 pm »
It says 42 students like swimming so
42=12+8+17+p
So p=5
40 students like only one sport so
40=q+20+8
So q=12
There are total 100 so add all the no the subtract from 100
you will get 1
r=1
Logged
Ghost Of Highbury
O_o_O lala!
SF Farseer
Posts: 4096
Reputation: 41428
Gender:
Namaskaram!
Re: Math help !
«
Reply #6 on:
May 17, 2009, 02:16:53 pm »
ohh.tks a lot
Logged
divine intervention!
susman
SF Immigrant
Posts: 110
Reputation: -5
Gender:
Re: Math help !
«
Reply #7 on:
May 17, 2009, 02:53:18 pm »
and yeah what about the c and e part?
need help...
thanks in advance
Logged
care
SF Immigrant
Posts: 53
Reputation: 6
Gender:
Re: Math help !
«
Reply #8 on:
May 17, 2009, 03:03:00 pm »
c)i) B' contains everything that is not in the B set. So, n(B')=8+p+q+r=26
c)ii) B?F contains 20, 25, 12, 17, p, q.
S' contains 20, 25, q, r.
(B?F)?S? contains elements that are contained in both - B?F and S'.
So, n((B?F)?S?)=20+25+q=57
Logged
Ghost Of Highbury
O_o_O lala!
SF Farseer
Posts: 4096
Reputation: 41428
Gender:
Namaskaram!
Re: Math help !
«
Reply #9 on:
May 17, 2009, 03:07:37 pm »
i onle got c i and e
c)i) n(B') means you don't take the whole of set B into consideration...therefore u r left with p q 8 and r..add them up
= 26
e)the total no. of people who like basketball are 74...12 of them also like swimming and 25 of them also like futball...so 25+12=37
the probability 4 the 1st student is 37/74
the probability for the 2nd is 36/73
multiply them
and u get 18/73
«
Last Edit: May 17, 2009, 03:12:51 pm by eddie_adi619
»
Logged
divine intervention!
Print
Pages: [
1
]
Go Up
« previous
next »
IGCSE/GCSE/O & A Level/IB/University Student Forum
»
Qualification
»
IGCSE/ GCSE
»
Subject Doubts
»
Math
»
Math help !