1. The problem statement, all variables and given/known data Find an expression of the statistical weight for a system of N particles of corresponding energy levels with 'gi' degeneracy. 2. Relevant equations W = N! / No! N1!2! ...Ni! 3. The attempt at a solution The expression is then : W = N! goNo g1N1 g2N2 ... giNi / No! N1! N2! ...Ni! However, I cant prove it. Can you help ?