permutation and combination problem  
there are 5 blue socks,4 red socks and 3 green one.in how many ways i can select 4 socks?

Re: permutation and combination problem  
13.. 
Re: permutation and combination problem  
can you explain how do you get to the answer 13? 
Re: permutation and combination problem  
12_{c4} 
Re: permutation and combination problem  
can you please explain it. 
Re: permutation and combination problem  
We have total 12 socks. We need to select 3 socks now.. we dont care about color. So answer should be : 12C4= 12*11*10*9/4*3*2 
Re: permutation and combination problem  
c(12,4) =12*11*10*9/4*3*2 =495 
Re: permutation and combination problem  
C(4+ 3  1, 3  1)  1????? How did u get dat? 
Re: permutation and combination problem  
See this:

Re: permutation and combination problem  
495 
Re: permutation and combination problem  
Suhani It'll be very nice if you can explain your answer also. Kamal Lohia 
Re: permutation and combination problem  
But why did you subtracted 1 ? 
Re: permutation and combination problem  
Because G= 3 and hence one case (i.e. GGGG ) is not possible. 