Answer
See explanation.
Work Step by Step
The formula of multiplicity is
$W = \frac{N!}{n_1!n_2!n_3.....n_m!}$
Where $N! $ = Arrangement of N number of molecules
The total of $n_1 + n_2 + n_3 ..... n_m$ should equal to the number of $N$.
Usually the number of n is equally distributed to given parts.
