For the system described in exercises 4.15 and 4.16 we have the canonical partition function
Show that
Use this result and the analogous formula for {NB} to show that {NA} / {NB} = qA/qB. Next consider the fluctuations from these mean values. Express the average of the square fluctua-tion, (NA}/ {NA} )2 , as appropriately weighted sums over states, and show that
Derive a similar expression for the fluctuations in NB.
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