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Solution check: How many persons saw both performances?

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#combinatorics #proof-verification
308
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Cube edges coloring with 3 colours

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#abstract-algebra #combinatorics
150
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What are the most elegant approximations of the sum of binomial terms, by using Stirling's approximation?

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#sequences-and-series #combinatorics #summation #approximation
1k
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How many malicious bingo cards are there?

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#combinatorics #matching-theory
2.1k
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Discrete math: How many arrangements are there of the 26 letters of the alphabet in which the five vowels are in consecutive places?

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#combinatorics #permutations
478
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Number of solutions for a given logical equation

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#combinatorics #elementary-number-theory #logic #problem-solving
990
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An equality with factorials

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#combinatorics
107
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Sums of powers of elements in a subset and polynomial with $\{-1,0,1\}$ coefficients

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#combinatorics #polynomials #contest-math
71
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log concavity and the equivalent inequalities

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#combinatorics #inequality
40
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How to prove that all the points in the plane are assigned the same value satisfying the given properties?

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#combinatorics #geometry
352
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Three gentlemen and three ladies are candidates for two vacancies.A voter has to vote for two candidates.In how many ways can on cast his vote?

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#combinatorics
3.6k
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Choosing office hours to maximise number of students who can attend at least one time slot

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#combinatorics #optimization
83
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What is the maximal value that we can have after 99 operations?

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#combinatorics #maxima-minima #combinatorial-game-theory #combinatorial-proofs
64
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Counting regions outside a convex hull

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#combinatorics
56
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Series of wheel. Permutation

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#combinatorics

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