For a gas of N-like particles Q= q/N! Where q is the partition function (sum over the states) for one particle, and Q is the N-particle partition function. Show that is the gas consisted for Ni particles of species 1 and N2 particles of species 2 the appropriate expression for Q would be: N1 N2 N! N,! Here q and q2 are the single particle partition functions for species 1 and 2, respectively.