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New posts in derangements
Generating a random derangement
permutations
algorithms
derangements
Determinant Formula for derangement of $n$ numbers?
linear-algebra
combinatorics
derangements
$\frac{1}{e}=$"Probability that every chocolate goes into a wrong spot".
probability
derangements
Counting some special derangements
combinatorics
derangements
Proof of subfactorial formula $!n = n!- \sum_{i=1}^{n} {{n} \choose {i}} \quad!(n-i)$
combinatorics
derangements
For any set of numbers $1$ through $n$, what is the average probability that two randomly selected derangements are derangements of each other?
combinatorics
permutations
combinations
derangements
Derangements of multisets
combinatorics
multisets
derangements
What's the probability that a given permutation has exactly $k$ fixed points. [duplicate]
probability
combinatorics
permutations
derangements
Derangement of $n$ elements
combinatorics
permutations
derangements
What is the probability that no letter is in its proper envelope?
probability
derangements
Why is $!n\pmod{n+k}$ a multiple of $k+1$ so often?
combinatorics
elementary-number-theory
derangements
Intuitive explanation for derangements [duplicate]
combinatorics
recurrence-relations
derangements
Derangements with repetitive numbers
probability
card-games
derangements
How many fixed points in a permutation
probability
combinatorics
derangements
Derangement formula for repeated permutation
combinatorics
permutations
derangements
Exponential Generating Function For Derangements
combinatorics
permutations
generating-functions
derangements
Why is the Derangement Probability so Close to $\frac{1}{e}$?
combinatorics
intuition
inclusion-exclusion
derangements
Combinatorial argument to prove the recurrence relation for number of derangements
combinatorics
recurrence-relations
inclusion-exclusion
combinatorial-proofs
derangements
Number of Derangements of the word BOTTLE
combinatorics
combinations
inclusion-exclusion
extremal-combinatorics
derangements
What's the General Expression For Probability of a Failed Gift Exchange Draw
probability
combinatorics
derangements
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