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## Topic review (newest first)

bobbym
2013-09-23 03:04:21

Hi Agnishom;

Here is the first gf problem I ever saw. Let's start right here.

How many ways can you pick  r balls from 3 green, 3 white, 3 blue and 3 gold?

anonimnystefy
2013-09-23 02:17:59

Okay, take your time.

bobbym
2013-09-23 02:11:02

Yes, I have but unfortunately I am a bit tied up at the moment. Please hold and as soon as I clear this up I will be there.

anonimnystefy
2013-09-23 02:00:54

Hi bobbym

Just a quick question: Have you seen the answer in the other thread?

bobbym
2013-09-23 01:51:06

If you are not confident yet, it is because you need more work. Let's do some and then see.

anonimnystefy
2013-09-23 00:16:43

Hi Agnishom

You can also check out this thread: http://www.mathisfunforum.com/viewtopic … 04&p=2.  Bobbym gave some interesting examples in that thread which use GFs like I did for the problem in this thread.

Agnishom
2013-09-23 00:07:01

We had, but I'm not confident about it

bobbym
2013-09-22 20:59:02

http://maths.freeforums.org/

Did you expand his gf?

We also had a good discussion about gf's right here.

http://www.mathisfunforum.com/viewtopic … 87#p268687

Agnishom
2013-09-22 20:55:15

this problem.

stefy's forum? I've lost the link

bobbym
2013-09-22 18:51:35

You asked that question in the other forum that we are both members of. I believe it was about partitions.

Generating functions are a way to change a combinatorics problem into a computational one. What would you like to do with them?

Agnishom
2013-09-22 13:14:35

I don't really understand how GFs are used. Could anyone teach me?

bob bundy
2013-09-22 12:32:21

Here they are:

Bob

anonimnystefy
2013-09-22 10:00:01

Ah, okay.

bob bundy
2013-09-22 09:52:04

No 72.  I just re-read the question and took out the repeated types.

It's just 24 x 6 divided by 2.

Bob

anonimnystefy
2013-09-22 09:47:37

144?

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