Combinations with repetition (multiset selection) (Multiset coefficient: C(n+r−1, r) for r selections from n distinct types)
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Multiset coefficient: C(n+r−1, r) for r selections from n distinct types
What each symbol means
| Symbol | What it stands for |
|---|---|
| n | Types/categories |
| r | Items selected (with replacement conceptually) |
When to use this
Types distinguishable; selections indistinguishable except by type counts; r can be any non-negative integer.