Question

Distributing teddy bears and lollipops - Combinatorics

score 176 · Answer 1 · 2026-04-14 13:17:36

176

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Distributing teddy bears and lollipops - Combinatorics

Published on 14 Apr 2026 - 13:17

score 1.2k · Answer 2 · 2026-04-15 21:26:52

1.2k

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Why do different permutations $pq$ and $qp$ have the same length?

Published on 15 Apr 2026 - 21:26

score 1.8k · Answer 3 · 2026-05-10 15:46:46

1.8k

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Combinatorics with arrangements of the word UNIVERSALLY

Published on 10 May 2026 - 15:46

score 2.1k · Answer 4 · 2026-04-10 13:43:07

2.1k

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Combinatorics Question on distribution of identical and distinct gifts.

Published on 10 Apr 2026 - 13:43

score 216 · Answer 5 · 2026-04-16 11:00:51

216

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Prove The Graph Formed by joining 2 Graphs Colorable in k colors by k-1 Edges is Colorable in k Colors

Published on 16 Apr 2026 - 11:00

score 113 · Answer 6 · 2026-04-14 11:28:07

113

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Creating a $6$-integer subset without repetition with no consecutive integers from $\{1,2,\dots,20\}$

Published on 14 Apr 2026 - 11:28

score 165 · Answer 7 · 2026-04-17 00:52:19

165

Views

Truncated alternating sum of binomial coefficients

Published on 17 Apr 2026 - 0:52

score 183 · Answer 8 · 2026-05-11 02:50:08

183

Views

4 professors and 7 students are to be seated on 11 chairs. What is the probability that every professor is between 2 students?

Published on 11 May 2026 - 2:50

score 3.1k · Answer 9 · 2026-05-11 05:18:01

3.1k

Views

A standard and rigorous proof using the pigeonhole principle

Published on 11 May 2026 - 5:18

score 272 · Answer 10 · 2026-05-11 07:22:52

272

Views

Creating a uniform distribution on the set of all $r$-regular graphs on $n$ vertices.

Published on 11 May 2026 - 7:22

score 108 · Answer 11 · 2026-04-12 09:50:41

108

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A complicated combinatoric equation for Stirling number

Published on 12 Apr 2026 - 9:50

score 149 · Answer 12 · 2026-04-11 00:16:05

149

Views

Evaluating the sum of $\sum_{k=0}^n \binom{n}{k}^2$

Published on 11 Apr 2026 - 0:16

score 1.2k · Answer 13 · 2026-04-14 05:53:54

1.2k

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How many 9-digit numbers are there with an even digit sum?

Published on 14 Apr 2026 - 5:53

score 265 · Answer 14 · 2026-04-16 16:00:38

In a sequence of length $8$ made up of characters $A, B, C, D$, how many sequences contain exactly $3$ of the $4$ characters?

score 239 · Answer 15 · 2026-04-12 07:19:45

239

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Size of intersection of U complement with C complement

Published on 12 Apr 2026 - 7:19

List Question

Distributing teddy bears and lollipops - Combinatorics

Why do different permutations $pq$ and $qp$ have the same length?

Combinatorics with arrangements of the word UNIVERSALLY

Combinatorics Question on distribution of identical and distinct gifts.

Prove The Graph Formed by joining 2 Graphs Colorable in k colors by k-1 Edges is Colorable in k Colors

Creating a $6$-integer subset without repetition with no consecutive integers from $\{1,2,\dots,20\}$

Truncated alternating sum of binomial coefficients

4 professors and 7 students are to be seated on 11 chairs. What is the probability that every professor is between 2 students?

A standard and rigorous proof using the pigeonhole principle

Creating a uniform distribution on the set of all $r$-regular graphs on $n$ vertices.

A complicated combinatoric equation for Stirling number

Evaluating the sum of $\sum_{k=0}^n \binom{n}{k}^2$

How many 9-digit numbers are there with an even digit sum?

In a sequence of length $8$ made up of characters $A, B, C, D$, how many sequences contain exactly $3$ of the $4$ characters?

Size of intersection of U complement with C complement

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