# 2Unit Mathematics 2007 Solutions (1 Viewer)

#### karljl

##### New Member
Hey...

For 3(b)(i) is it necessary to simplify the expression to:
650 + 100n

rather than
750 + 100(n-1)

??
not sure, i simplified it but don't know if we needed to.

POAD: we were aloud to take it out of exam room at the end unless you left early...

#### Tulinny

##### New Member
Thanks for those solutions..Helps heaps to see what markss i'm gonna gettt

tulin

#### *maria*

##### Member
Hey thanx. Btw i'm not sure that your 9bi is right. isn't it 1/52 x 39/51 and then x 4 because there are 4 suits and they havn't specified a suit?

#### 0xXx5

##### New Member
Awesome, well done.

Im pretty confident for Q1-7ish, 8 was.. meh. Then 9 and 10? Yuck. Anyway, is the exam paper up anywhere on the 'net? I really wanna take another look at it.. (how did you gain access to it?)

We got to take the paper home didnt u keep urs, q.1-9 my lowest was 7/12 in q 7 and was going at 87% b4 q.10 screwed me over aswell as time i got 1/12 for q.10 dammnit lol

##### Member
karljl said:
POAD: we were aloud to take it out of exam room at the end unless you left early...
Oh really? Damn. =|

##### Member
*maria* said:
Hey thanx. Btw i'm not sure that your 9bi is right. isn't it 1/52 x 39/51 and then x 4 because there are 4 suits and they havn't specified a suit?
I'm not sure....can anyone else verify this???

#### karljl

##### New Member
*maria* said:
Hey thanx. Btw i'm not sure that your 9bi is right. isn't it 1/52 x 39/51 and then x 4 because there are 4 suits and they havn't specified a suit?
put it this way: the probability is dependent on the first card you pull out so there fore it doesn't matter what you pull out... you get a club and then u have 39 non clubs to choose from from the 51 cards that are left

does that clear it up??

#### Kmara2nv

##### Member
good work man....ma feelings of doign good have dropped lol...at first i thouht i was 100+/120....but seeing that im abot 95/120

oh welll lets hope it scalesss well

##### Member
*maria* said:
Hey thanx. Btw i'm not sure that your 9bi is right. isn't it 1/52 x 39/51 and then x 4 because there are 4 suits and they havn't specified a suit?
Maria,

I found that if you multiply it by 4, then the probability is > 1 (which is impossible)

#### t.j.howlett

##### New Member
hey thnku sooo much for these ur a legend im expecting around 106/120

#### somewhereelse

##### Member
thanks! this is heaps good. i made lots of mistakes...

BUT I GOT THE PROBABILITY ONE RIGHT!!

im so proud of myself.. hah..

#### *maria*

##### Member
Maria,

I found that if you multiply it by 4, then the probability is > 1 (which is impossible)
no, it's 1/17. which is less then 1. which is possible. Lol-i'm really clinging onto the marks that will keep me in mid band 6.

#### shauncrowe

##### New Member
If It's 2.88 years plus January 2009, It would be November 2011. I'm pretty sure.

#### ss193.02

##### New Member
Maria,

I found that if you multiply it by 4, then the probability is > 1 (which is impossible)
If I remember the question correctly, 2 cards are drawn and not replaced.

If it asks the probability of the 2nd card being of a different suit to the 1st, it means the 1st can be ANY of the 52 cards, therefore 52/52 chance.

Then there are 51 cards left, 13x3 of which are NOT from the same suit as card 1. So your original answer is right matt: 39/51

#### shauncrowe

##### New Member
Its 52/52 * 39/51 * 26/50 * 13/49

I'm quite sure.

#### *maria*

##### Member
omg.
gulp. there goes another mark. here i sat thinking that was right. lol. oh well...

#### karljl

##### New Member
shauncrowe said:
Its 52/52 * 39/51 * 26/50 * 13/49

I'm quite sure.
39/51 is for part (i) and ur answer is for (ii)

#### the-1-n-only-me

##### Member
shauncrowe said:
Its 52/52 * 39/51 * 26/50 * 13/49

I'm quite sure.

woot. thats what i had i think. hopefully those countless years of playing big2 finally paid off.

to thread starter: thanks alot. my friend emailed the solutions to me. personally i havent looked at them and im not sure if i wanna. i just have one question? did you actually come home after it and rewrite all of this or what? because redoing this paper wouldve been the last thing on my mind.

##### Member
the-1-n-only-me said:
woot. thats what i had i think. hopefully those countless years of playing big2 finally paid off.

to thread starter: thanks alot. my friend emailed the solutions to me. personally i havent looked at them and im not sure if i wanna. i just have one question? did you actually come home after it and rewrite all of this or what? because redoing this paper wouldve been the last thing on my mind.
yer lol