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threshold graph and degree sequence proof

Published on
#combinatorics #graph-theory
35
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What distribution is there?

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#probability #combinatorics #statistics #probability-distributions #hypergeometric-function
155
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prove $\sum_{r=1}^{n}\binom{n}{r}\binom{n-1}{r-1}=\binom{2n-1}{n-1}$

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#combinatorics
195
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Gauss's Identities

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#combinatorics
2.1k
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How to partition a set into k subsets, given minimum subset size is limited by some constant?

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#combinatorics #combinations
309
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Inclusion exclusion for distributing distinguishable items to indistinguishable groups

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#combinatorics #permutations #combinations #inclusion-exclusion
126
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The Number of Surjections Restricted to Derangements

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#combinatorics #group-theory #permutations #combinations
1k
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Ways to make square from a grid uneven-spaced

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#combinatorics
30
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When do the partitions of a number characterized by their arm and leg lengths?

Published on
#combinatorics #number-theory
248
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What is the minimum number of questions to find the ring

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#combinatorics #algorithms #combinatorial-game-theory #algorithmic-game-theory
166
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Is this is a bipartite graph?

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#combinatorics #graph-theory #bipartite-graphs
42
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Coloring symmetry problem

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#combinatorics
1.7k
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Find the number of five-digit multiples of $5$, where all the digits are different, and the second digit (from the left) is odd.

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#combinatorics
446
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A Problem Dealing with putting balls in bin and Expected Value - possible wrong answer

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#probability #combinatorics
195
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Find deviation in grid walk

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#combinatorics

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