Help needed in a combinatorics problem

Правка en1, от 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!

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en1 Английский skpro19 2016-08-19 01:48:27 302 Initial revision (published)