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

Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: wassup on October 27, 2009, 03:13:20 pm

Title: HELP!!!
Post by: wassup on October 27, 2009, 03:13:20 pm

The question is shade AUB'. Why is the pointed part shaded? (See below)

Title: Re: HELP!!!
Post by: @d!_†oX!© on October 27, 2009, 03:14:58 pm

dude cuz di is A union B'
if it was A intersection B' then we wouldn't shade that part!!

Title: Re: HELP!!!
Post by: nid404 on October 27, 2009, 03:17:04 pm

yaa that's right

B^'  is everything not in B...which includes A and the rest of the universal set. and it is union A and A consists of the shaded oart also

Title: Re: HELP!!!
Post by: wassup on October 27, 2009, 03:20:31 pm

thanks fr d help.

Title: Re: HELP!!!
Post by: Ash16 on October 27, 2009, 03:21:14 pm

Hey i got that, but can u explain why we wouldn't shade that part if it was A intersection B' ???  :-[

Title: Re: HELP!!!
Post by: nid404 on October 27, 2009, 03:24:08 pm

intersection would mean common between A and B^'
So u would only shade A without the intersection or the rest of the universal set

Title: Re: HELP!!!
Post by: nid404 on October 27, 2009, 03:24:54 pm

The set of only A is common between A and B^'

Hope u understood

tell me if u need a diagram

Title: Re: HELP!!!
Post by: Ash16 on October 27, 2009, 03:25:38 pm

Yah!  :D Thankyou!

Title: Re: HELP!!!
Post by: nid404 on October 27, 2009, 03:26:54 pm

Quote from: Ash16 on October 27, 2009, 03:25:38 pm

Yah!  :D Thankyou!

you need a diagram or u understood??

Title: Re: HELP!!!
Post by: Ash16 on October 27, 2009, 03:28:11 pm

A diagram could help for clarity.. Thanks!!!

Title: Re: HELP!!!
Post by: holychalice on October 27, 2009, 03:30:47 pm

See .. intersection is d part both d sets share ... if its compliment of B ...
it wud share only A widout intersection of A nd B ... because this intersection dusnt cum in B' ....
is this rite ?
 

Title: Re: HELP!!!
Post by: Ash16 on October 27, 2009, 03:33:18 pm

Yeah that makes it clear!! thanks manbir :D

Title: Re: HELP!!!
Post by: nid404 on October 27, 2009, 03:36:13 pm

Quote from: Ash16 on October 27, 2009, 03:28:11 pm

A diagram could help for clarity.. Thanks!!!

cool

Diagram one shows set of A
Diagram two shows set of B^'

Diagram three is intersection of the two....what is common in the two diagrams?? Only set of A

Title: Re: HELP!!!
Post by: holychalice on October 27, 2009, 03:39:13 pm

Yea .. its like putting 2 diagrams on top of each other nd den d part which is double shaded ( or as nid said common ) is ur answer

Title: Re: HELP!!!
Post by: nid404 on October 27, 2009, 03:40:37 pm

sorry i posted them on the wrong thread :P....check https://studentforums.biz/index.php/topic,4523.0.html

Title: Re: HELP!!!
Post by: Ash16 on October 27, 2009, 03:41:39 pm

Lol! Thanks alot nid and manbir!! Great help! :)

Title: Re: HELP!!!
Post by: nid404 on October 27, 2009, 03:49:36 pm

Quote from: Ash16 on October 27, 2009, 03:41:39 pm

Lol! Thanks alot nid and manbir!! Great help! :)

hehe welcome :D

Title: Re: HELP!!!
Post by: **!!superexcited!!!** on October 27, 2009, 06:47:21 pm

uhmm.. guys plz see if u can help me wid this....
A company makes two models of television.
Model A has a rectangular screen dat measures 44cm by 32cm.
Model B has a larger screen with these measurements increased in d ration 5:4

Work out d measurements of larger screen.

Title: Re: HELP!!!
Post by: Ghost Of Highbury on October 27, 2009, 06:55:02 pm

5/4 = 1.25

1.25 * 44 = 55

1.25 * 32  = 40

55, 40

Title: Re: HELP!!!
Post by: **!!superexcited!!!** on October 28, 2009, 12:14:53 am

thanx :)