Virial Expansion, Van Der Waals Gas

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Homework Statement



Taken from 'Concepts in Thermal Physics':

14w4kli.png


Homework Equations





The Attempt at a Solution



For the step highlighted in red, why does the '-1' go into the integrand?
 
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1 integrated over the space gives the volume of the space. Divide that by the factor 1/V^N outside the integral and you get minus one. Hence cancelling the plus one outside the integral.
 
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