And (2,3, -1)? No.
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- Or (1,1,2) and perm.
- What about (0,0,4)? No.
- Or (3,1,0)? Already included.
- Is (1,3,0) different? No.
- So only three distinct multisets.
- But standard stars and bars for unordered non-negative integers: number of integer partitions of 4 into at most 3 parts, where order doesn't matter, or equivalently, number of solutions in non-decreasing triples.
