Permutations of multiset $\frac{n!}{p!q!r!}$ (n objects with duplicates: divide factorial by factorials of counts per)
jee-mainjee-advanced
n objects with duplicates: divide factorial by factorials of counts per type.
What each symbol means
| Symbol | What it stands for |
|---|---|
| n,p,q,r | Total and repetition multiplicities |
When to use this
Objects partitioned into identical classes.