The expression for the monatomic gas partition function Q(N,V,B)

The expression for the monatomic gas partition function Q(N,V,B)

not a simple product of all molecular partition function q(V,B),but rather is that product divided by a factor of N!. What property of a system containing a monatomic ideal gas justifies the use of this partition function an why specially is a factor of N!used?

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