Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#1 2008-10-01 13:08:12
- saveme
- Guest
combinatorial proof
Hi 
I'm really really having hard time proving this in a combinatorial way:
the problem is that I do not even understand what DOES IT COUNT 
can you help me sorting this out?
#2 2008-10-01 13:09:10
- saveme
- Guest
Re: combinatorial proof
EDIT: that '(nk)' is actually 'n choose k' but I didn't know how to do it in LaTex
#3 2008-10-01 17:56:24
- Ricky
- Moderator
- Registered: 2005-12-04
- Posts: 3,791
Re: combinatorial proof
1 = 1
1 + 2 = 3
1 + 2 + 3 = 6
1 + 2 + 3 + 4 = 10
"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."
Offline
#4 2008-10-02 00:56:03
- saveme
- Guest
Re: combinatorial proof
I do not think that is the correct answer: the right side of the equality does not count the sum of the first n integers 
anyway I solved this one tonight, so this can be closed
#5 2008-10-02 10:25:41
- Ricky
- Moderator
- Registered: 2005-12-04
- Posts: 3,791
Re: combinatorial proof
Ah, I did not see the factorial there.
"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."
Offline
#6 2008-10-04 09:42:55
- G_Einstein
- Member
- Registered: 2008-08-30
- Posts: 124
Re: combinatorial proof
Se Zoti vete e tha me goje,se kombet shuhen permbi dhe,por SHqiperia do te roje,per te,per te luftojme ne.
God said that all nation exincts on the ground,but Albania will survive,for it,for it we are fighting.
Offline
#7 2008-10-04 09:47:43
- G_Einstein
- Member
- Registered: 2008-08-30
- Posts: 124
Re: combinatorial proof
Se Zoti vete e tha me goje,se kombet shuhen permbi dhe,por SHqiperia do te roje,per te,per te luftojme ne.
God said that all nation exincts on the ground,but Albania will survive,for it,for it we are fighting.
Offline
#8 2008-10-04 09:48:21
- G_Einstein
- Member
- Registered: 2008-08-30
- Posts: 124
Re: combinatorial proof
Last edited by G_Einstein (2008-10-04 10:03:54)
Se Zoti vete e tha me goje,se kombet shuhen permbi dhe,por SHqiperia do te roje,per te,per te luftojme ne.
God said that all nation exincts on the ground,but Albania will survive,for it,for it we are fighting.
Offline
#9 2008-10-04 09:54:50
- G_Einstein
- Member
- Registered: 2008-08-30
- Posts: 124
Re: combinatorial proof
Last edited by G_Einstein (2008-10-04 10:02:40)
Se Zoti vete e tha me goje,se kombet shuhen permbi dhe,por SHqiperia do te roje,per te,per te luftojme ne.
God said that all nation exincts on the ground,but Albania will survive,for it,for it we are fighting.
Offline
#10 2008-10-04 10:04:58
- G_Einstein
- Member
- Registered: 2008-08-30
- Posts: 124
Re: combinatorial proof
Last edited by G_Einstein (2008-10-04 10:08:57)
Se Zoti vete e tha me goje,se kombet shuhen permbi dhe,por SHqiperia do te roje,per te,per te luftojme ne.
God said that all nation exincts on the ground,but Albania will survive,for it,for it we are fighting.
Offline
#11 2008-10-04 10:09:30
- G_Einstein
- Member
- Registered: 2008-08-30
- Posts: 124
Re: combinatorial proof
Sorry,I'm trying to write you the answer but it doesn't work
Se Zoti vete e tha me goje,se kombet shuhen permbi dhe,por SHqiperia do te roje,per te,per te luftojme ne.
God said that all nation exincts on the ground,but Albania will survive,for it,for it we are fighting.
Offline
#12 2008-10-04 12:12:00
- Ricky
- Moderator
- Registered: 2005-12-04
- Posts: 3,791
Re: combinatorial proof
Fixed your LaTeX, G_Einstein. But saveme already said:
anyway I solved this one tonight, so this can be closed
"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."
Offline
Pages: 1