Multinomial expansion (Coeff n!/(n1!nk!) when n1++nk=n)
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Coeff n!/(n1!…nk!) when n1+…+nk=n
What each symbol means
| Symbol | What it stands for |
|---|---|
| k | Number of summands |
| n_i | Non-negative integers summing to n |
When to use this
Non-negative integer exponents partitioning n.