Planck average energy reduce to Boltzmann energy

War-Saw
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Hi I'm new here with new problem. I have to show how can the Planck average energy reduce to Boltzmann energy in the limit of no quantization, but I have some problems to understand how should I solve this.
If you have any ideas or answers or maybe some materials please send me a MAIL or answer here in this topic.
 
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What do you mean exactly by the Boltzmann energy?
 
Energy from the Boltzmann Distribution
 

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