Help needed in a combinatorics problem

Revision en1, by skpro19, 2016-08-19 01:48:27

The problem is this

After going through the submitted solution, I found the answer is this-> w! * b! * (w -1)* C(w + b — 3, n — 3)

Can someone please explain how this solution is coming.

Thanks!

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en1 English skpro19 2016-08-19 01:48:27 302 Initial revision (published)