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15
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Asymptotics of $e^{-n}\sum_{k=0}^{n-1}\frac{n^k}{k!}\cdot\frac1{n-k}$

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#combinatorics #binomial-coefficients #generating-functions
433
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How many palindromes of length 5 can be formed that contain 7 or 8?

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#combinatorics #palindrome
128
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Using summation by parts on a combination

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#combinatorics #discrete-mathematics #summation #discrete-calculus #summation-by-parts
798
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Probability of selecting a set of three numbers from S={1,2,3,..,20}

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#probability #combinatorics #combinations
183
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If $p^k|n!$ then $p!^k|n!$

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#combinatorics #elementary-number-theory
42
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Proving Minimality Of Partition Into Disjoint Subsets

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#combinatorics #optimization
90
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Number of partitions of an integer into four parts

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#combinatorics
122
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How many functions are there from [9] to [7] if every image in the codomain has 3 arguments in the domain?

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#combinatorics #functions #permutations #combinations
280
Views

What does aIb here mean?

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#combinatorics
1.2k
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A student must pick 5 classes from 12 courses, if he must have at least one WH class or USH class, how many different choices does he have?

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#combinatorics #combinations
147
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Doing union of probabilities by taking product of individual probabilities

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#probability #combinatorics
389
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$\eta$-value of a partition and its meaning

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#combinatorics #representation-theory #young-tableaux #algebraic-combinatorics
309
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Spivak's Calculus: Proofs concerning Pascal's Triangle

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#combinatorics #elementary-set-theory #binomial-coefficients #combinatorial-proofs
833
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Difference between permutations and a symmetric group

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#combinatorics #group-theory #permutations #symmetric-groups
474
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Latin Square Problem: Indempotent Commutative Quasigroup of Order 7

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#combinatorics #combinatorial-designs #latin-square #cayley-table

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