List questions from pigeonhole-principle

Published on 16 Jul 2020 - 15:21

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How many vertices with same degree

Published on 20 Jul 2020 - 7:57

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Show that for every integer $n$ there is a multiple of $n$ that has only $0s$ and $1s$ in its decimal expansion.

Published on 20 Jul 2020 - 20:53

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Pigeonhole Principle Question: Jessica the Combinatorics Student

Published on 08 Jul 2016 - 21:02

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Jessica the Combinatorics Student, part 2

Published on 08 Jul 2016 - 23:09

479

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Least distance between two points in an equilateral triangle

Published on 18 Jul 2016 - 16:32

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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 $2^{n}$.

Published on 26 Mar 2026 - 5:41

414

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The pigeonhole principle - how to solve questions like that?

Published on 25 Jul 2016 - 9:38

172

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A Combinatorics Problem with x+y = z

Published on 26 Mar 2026 - 6:21

104

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Pigeonhole solution for product of elements of a group $H$ closed under ordinary multiplication

Published on 06 Aug 2016 - 3:56

1.5k

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What is the maximum possible number of elements of S?

Published on 23 Aug 2016 - 19:13

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Counting pigeonhole principle

Published on 25 Aug 2016 - 7:10

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Permutation subsequences

Published on 25 Aug 2016 - 17:10

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Tips on identifying pigeon and pigeonhole

Published on 26 Aug 2016 - 18:58

72

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Proving the tightness of a theorem regarding permutations

Published on 29 Aug 2016 - 16:01

List Question

Pigeonhole Principle Proof and Existence

How many vertices with same degree

Show that for every integer $n$ there is a multiple of $n$ that has only $0s$ and $1s$ in its decimal expansion.

Pigeonhole Principle Question: Jessica the Combinatorics Student

Jessica the Combinatorics Student, part 2

Least distance between two points in an equilateral triangle

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 $2^{n}$.

The pigeonhole principle - how to solve questions like that?

A Combinatorics Problem with x+y = z

Pigeonhole solution for product of elements of a group $H$ closed under ordinary multiplication

What is the maximum possible number of elements of S?

Counting pigeonhole principle

Permutation subsequences

Tips on identifying pigeon and pigeonhole

Proving the tightness of a theorem regarding permutations

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