IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Math => Topic started by: zubair_slipknot on May 17, 2009, 07:38:59 am

Title: Maths Paper 4 May June 2008
Post by: zubair_slipknot on May 17, 2009, 07:38:59 am

There is probablity question on pg3 question 3 (a) and (b)...can someone plz help me as i totoaly suck in probablity... :-[ :'(

Title: Re: Maths Paper 4 May June 2008
Post by: Ukhti-R on May 17, 2009, 07:44:34 am

ooooh, tht paper is hard man
Ill be finishing it off later on 2day
Ill probaby let u know then  :D

By the way, for P2, the locus Question- we hd to draw parallel lines,  who did tht ?

Title: Re: Maths Paper 4 May June 2008
Post by: zubair_slipknot on May 17, 2009, 07:46:08 am

thx for your help....yea tht was confusing and i had less time...

Title: Re: Maths Paper 4 May June 2008
Post by: Ukhti-R on May 17, 2009, 07:47:31 am

its k, but I didnt help  :P

so wot did u do fr tht question then ?

Title: Re: Maths Paper 4 May June 2008
Post by: Tammy on May 17, 2009, 07:49:31 am

In paper 2... the locus thing
I drew two angle bisectors... one horizontal and the other vertical.
The parallel lines are wrong!

Title: Re: Maths Paper 4 May June 2008
Post by: Ukhti-R on May 17, 2009, 07:51:58 am

angle bisectors !?!!
noooo mate ..

how do u know parallel lines r rong ?

Title: Re: Maths Paper 4 May June 2008
Post by: zubair_slipknot on May 17, 2009, 07:52:27 am

well i did the (a) part

(i) P=1/3
    q=3/8
    r=6/8
    s=2/8
but i wanted to verify it whether its correct or not...the (b) part i have no idea how to do

Title: Re: Maths Paper 4 May June 2008
Post by: zubair_slipknot on May 17, 2009, 07:55:07 am

(ii) 5/12
(iii) 5/18

Title: Re: Maths Paper 4 May June 2008
Post by: zubair_slipknot on May 17, 2009, 08:00:14 am

any help in october novmeber 2008 paper...tell me...i will try my best to help

Title: Re: Maths Paper 4 May June 2008
Post by: Ghost Of Highbury on May 17, 2009, 08:03:48 am

okk.,
your a)i) answers are correct...By the way...r=6/8...=3/4 (lowest terms, always)
  a)ii) is correct but a)iii) ...the answer is 2/3

a)iii) A white ball can pop up from bag A OR bag b
   the probability of white ball from bag A is (2/3 * 5/8)
   the probability of white ball from Bag B is (1/3*3/4)
soo u add them up because its OR....i.e (2/3*5/8)+(1/3*3/4)...= 5/12 + 1/4 = 2/3
 :) :) hope u understood

Title: Re: Maths Paper 4 May June 2008
Post by: unown.xu on May 17, 2009, 08:09:42 am

in paper 2 locii question, the answer is two/four angle bisectors, one on top, on left, right, down... or just one vertical and one horizontal. i am 100% sure of this.... i did it wrong though, i made only one line...

the question:
draw the locii for all points equidistant from line AC and line BD (whatever the letter were) inside the quadrilateral ABCD.

the drawing was something like this: (ascii art, i suck at it...)
A\------------ B
   \             /
    \           /                 there were already lines between A and C, and between B and D, just its too hard to draw them
     \         /                                 on this diagram, because there are only a few different symbols for slants, none work... (/\)
   D \------ C

Title: Re: Maths Paper 4 May June 2008
Post by: I Jimmy I on May 17, 2009, 08:20:10 am

OMG!!!!!!!!!!!!!!!!!!!!!!!!!
Tomorrow is Business and Maths and I still didnt study a thing!!!!!
Im SCREWED!!!!!!!!!!!!!!!!!!!!