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Guichard-Combinatorics-Graph-Theory
· Problem 1.5.3
Fundamentals
Mathematics — Probability · permutations-multisets
Problem
How many permutations are there of the multiset
{
1
⋅
a
1
,
1
⋅
a
2
,
…
,
1
⋅
a
n
}
\{1 \cdot a_1, 1 \cdot a_2, \ldots, 1 \cdot a_n\}
{
1
⋅
a
1
,
1
⋅
a
2
,
…
,
1
⋅
a
n
}
?
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