Question

Knowing how to order $\{a,b,c,0\}$ implies knowing how to order $\{a,b,c,0,-a,-b,-c\}$?

score 37 · Answer 1 · 2026-04-15 18:15:52

37

Views

Knowing how to order $\{a,b,c,0\}$ implies knowing how to order $\{a,b,c,0,-a,-b,-c\}$?

Published on 15 Apr 2026 - 18:15

score 425 · Answer 2 · 2026-04-14 13:29:40

425

Views

Probability that Santa will give $N$ different presents to exactly $N-1$ kids

Published on 14 Apr 2026 - 13:29

score 284 · Answer 3 · 2026-05-15 09:08:51

284

Views

The pigeonhole principle - $30$ pens in a drawer

Published on 15 May 2026 - 9:08

score 221 · Answer 4 · 2026-05-11 06:44:06

221

Views

$n$ guests, each guest brings a prize, how many ways may the prizes be given out so nobody gets the prize that they brought?

Published on 11 May 2026 - 6:44

score 3.2k · Answer 5 · 2026-04-16 06:09:19

3.2k

Views

In any group of 17 people, where each person knows 4 others, you can find 2 people, which don't know each other and have no common friends.

Published on 16 Apr 2026 - 6:09

score 70 · Answer 6 · 2026-04-23 23:49:47

70

Views

Strange method to obtain strange number theoretic identities?

Published on 23 Apr 2026 - 23:49

score 371 · Answer 7 · 2026-05-10 16:00:14

371

Views

Eigenvalues of an adjacency matrix

Published on 10 May 2026 - 16:00

score 176 · Answer 8 · 2026-05-11 06:44:07

176

Views

Determine the number of integer solutions to $x_1 + x_2 + x_3 + x_4 = 19$, where $−5 \le x_i \le 10$ for all $1 \le i \le 4$

Published on 11 May 2026 - 6:44

score 78 · Answer 9 · 2026-04-13 20:25:37

78

Views

graph theory and linear algebra

Published on 13 Apr 2026 - 20:25

score 32 · Answer 10 · 2026-04-12 18:23:51

32

Views

How many copies of a graph $H$ containing a fixed edge in $[n]$?

Published on 12 Apr 2026 - 18:23

score 223 · Answer 11 · 2026-05-10 22:02:56

223

Views

Expected number of parts of a uniformly selected partition of $n$

Published on 10 May 2026 - 22:02

score 37 · Answer 12 · 2026-04-13 19:27:06

37

Views

Reason for difference in number of five-card hands.

Published on 13 Apr 2026 - 19:27

score 202 · Answer 13 · 2026-04-16 17:18:46

202

Views

Proving that there is an element common to all $35$ sets given certain set restrictions

Published on 16 Apr 2026 - 17:18

score 20.4k · Answer 14 · 2026-04-12 00:54:50

20.4k

Views

Binomial Theorem with Three Terms

Published on 12 Apr 2026 - 0:54

score 139 · Answer 15 · 2026-04-14 13:29:50

139

Views

Probability when arranging $N$ different numbers in a line

Published on 14 Apr 2026 - 13:29

List Question

Knowing how to order $\{a,b,c,0\}$ implies knowing how to order $\{a,b,c,0,-a,-b,-c\}$?

Probability that Santa will give $N$ different presents to exactly $N-1$ kids

The pigeonhole principle - $30$ pens in a drawer

$n$ guests, each guest brings a prize, how many ways may the prizes be given out so nobody gets the prize that they brought?

In any group of 17 people, where each person knows 4 others, you can find 2 people, which don't know each other and have no common friends.

Strange method to obtain strange number theoretic identities?

Eigenvalues of an adjacency matrix

Determine the number of integer solutions to $x_1 + x_2 + x_3 + x_4 = 19$, where $−5 \le x_i \le 10$ for all $1 \le i \le 4$

graph theory and linear algebra

How many copies of a graph $H$ containing a fixed edge in $[n]$?

Expected number of parts of a uniformly selected partition of $n$

Reason for difference in number of five-card hands.

Proving that there is an element common to all $35$ sets given certain set restrictions

Binomial Theorem with Three Terms

Probability when arranging $N$ different numbers in a line

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