Maths: Choosing

Smithy · 2 Nov 2006 at 10:05

Ahhh i love maths questions that are based on real life problems. (sarcasm)

Why cant examining boards cut out the bullcrap and get to the point of the question? tis one thing which infruriated me when i did maths.

demon8991 · 2 Nov 2006 at 10:11

Owww i dont know im soo confused, my brain has been used too much these last few days.

Raumarik · 2 Nov 2006 at 10:43

isnt this the sort of thing that's on those rubbish late night TV phone ins offering cash that nobody ever wins?

welshtom · 2 Nov 2006 at 11:14

demon8991 said:
Owww i dont know im soo confused, my brain has been used too much these last few days.

I think you should stop asking for answers on forums (bad idea, esp if someone grasses you up) and read through the books that you should have been advised to read.

just my opinion

Tom

Grrrrr · 2 Nov 2006 at 11:18

welshtom said:
I think you should stop asking for answers on forums (bad idea, esp if someone grasses you up) and read through the books that you should have been advised to read.

just my opinion

Tom

He's just asking for help, it's no different to asking a mate from your class

welshtom · 2 Nov 2006 at 11:26

Grrrrr said:
He's just asking for help, it's no different to asking a mate from your class

But you shouldnt get answers, only guidance otherwise he'll never learn anything.

Grrrrr · 2 Nov 2006 at 12:07

You sound like someone in their mid 40s. It's pretty clear from his posts that he's trying to learn and not just cheat his way to 10/10 in his next homework

welshtom · 2 Nov 2006 at 12:21

Guess im old before my time then

demon8991 · 2 Nov 2006 at 13:41

Lol im not trying to cheat mate, just wanna learn and tbh my notes that we have got are pretty poor, they dont give any examples of algebraic permatations or choosing, thats why im finding it hard.

welshtom · 2 Nov 2006 at 13:45

demon8991 said:
Lol im not trying to cheat mate, just wanna learn and tbh my notes that we have got are pretty poor, they dont give any examples of algebraic permatations or choosing, thats why im finding it hard.

ahh poor notes, my lecturers decided to define that notion in my last year of Uni

.

Any books on the subject area in your library? If its made it into a book its normally a little more clear than a teacher can knock up

demon8991 · 2 Nov 2006 at 19:38

demon8991 said:
'Determine the number of visually distinct that p red balls and q blue balls can be placed in a line.'.

Still not 100% sure about this one really struggling with it.

demon8991 said:
'Determine the number of ways that n = p + q + r objects can be divided into three groups with the first containing p objects, the second q, and the third r'.

Been thinking about this one.

and i figured that p objects have to be taken from p + q + r, q objects from p + q + r and r objects from p + q + r

So is it just.

(p + q + r/p) X (p + q + r/q) X (p + q + r/r)

Hiroki · 2 Nov 2006 at 19:47

'Determine the number of visually distinct that p red balls and q blue balls can be placed in a line.'.

- with regards to this question think of it in terms of:

"how many ways can i arrange p red balls in p+q slots?"

The answer you have come up with for 'Determine the number of ways that n = p + q + r objects can be divided into three groups with the first containing p objects, the second q, and the third r'. is wrong

Hiroki

DaveF · 2 Nov 2006 at 20:46

demon8991 said:
So is it just.

(p + q + r/p) X (p + q + r/q) X (p + q + r/r)

No. Do you know how many ways are there of choosing p objects from (p+q+r)?