Let’s say i have n identical classical non interacting particles and N sites where i can put them in. BUT the total energy is given.(adsbygoogle = window.adsbygoogle || []).push({});

The number of possible states is (N)^n/n!/(n/2)!

Where N^n is the total possibilities to arrange the particles.

We divide it by n! since they are identical.

and the reason we divide by (n/2)! has some thing to do with the fact that the energy is given but I don’t know how.

i whould be very thankful to any one who can say why (n/2)!

thanks shai

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# States counting of many particales under a constraint

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