Pigeonhole Principle in combinatorics
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pigeonhole principle: at least 1 match/hr for 75 hrs, at most 125 matches, then exactly 24 matches in some interval
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Combinatorics - binary - very interesting question
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Use Pigeonhole to show of any set of $2^{n+1}-1$ positive integers is possible choose $2^{n}$ elements such that their sum is divisible by $2^{n}$.
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Circular permutations with indistinguishable objects
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An unexpected application of non-trivial combinatorics
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Olympiad question on Pigeonhole principle
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Proving a combinatorial identity without double counting
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Pigeon Hole Principle Problem I'm kind of lost for how to go about this.
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combinatorics circular arrangement problem
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Problem concerning the use of Pigeonhole (Box) principle
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Pigeon-Hole Principle Common Sum
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Can the principle of inclusion/exclusion be used to count elements in the intersection of a sequence of sets?
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Musical and combinatorial proof
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Combinatorics Question Asking How Many Integer Solutions Given Different Restrictions
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Are there any Combinatoric proofs of Bertrand's postulate?
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Number of certain (0,1)-matrices, Stanley's Enumerative Combinatorics
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Number of ways to choose two disjoint subsets of a set