Question

Additional properties of finite series that have the property: $\sum a_k = -\sum \frac{a_k}{k}$

score 166 · Answer 1 · 2026-04-13 17:09:05

Additional properties of finite series that have the property: $\sum a_k = -\sum \frac{a_k}{k}$

Published on 13 Apr 2026 - 17:09

score 133 · Answer 2 · 2026-03-29 14:59:09

how many ways can all 10 different prizes be given to the 6 consolation winners so that 1 gets 3 prizes, 2 get 2 prizes each, and 3 get 1 prize each?

score 687 · Answer 3 · 2026-04-06 07:29:18

687

Views

Total number of leaves binary tree with n internal nodes

Published on 06 Apr 2026 - 7:29

score 318 · Answer 4 · 2026-04-08 17:07:26

318

Views

An interesting series converging to a constant

Published on 08 Apr 2026 - 17:07

score 436 · Answer 5 · 2026-04-06 18:18:37

436

Views

There is two triangles with common edge in graph $\Gamma$

Published on 06 Apr 2026 - 18:18

score 105 · Answer 6 · 2026-03-25 17:40:32

105

Views

Number of antisymmetric relationships in set

Published on 25 Mar 2026 - 17:40

score 296 · Answer 7 · 2026-03-26 06:06:50

296

Views

Proving a combinatorial identity: $\sum_{i=0}^m \binom{l}{i}\binom{m+n-l}{m-i} = \binom{m+n}{m}$

Published on 26 Mar 2026 - 6:06

score 33 · Answer 8 · 2018-06-01 07:29:00

33

Views

How many $n$ length vector can be?

Published on 01 Jun 2018 - 7:29

score 506 · Answer 9 · 2018-06-01 07:52:32

506

Views

A password with 7 digits

Published on 01 Jun 2018 - 7:52

score 87 · Answer 10 · 2018-06-01 08:44:41

87

Views

How many numbers $x$ less than $30030$ are there such that $30030$ divides $x^3-1$

Published on 01 Jun 2018 - 8:44

score 52 · Answer 11 · 2026-04-11 08:48:13

52

Views

Calculate the number of ways for random walk

Published on 11 Apr 2026 - 8:48

score 69 · Answer 12 · 2026-04-12 19:13:30

69

Views

The outcome of a hidden coin, given evidence about total heads across all coins

Published on 12 Apr 2026 - 19:13

score 107 · Answer 13 · 2026-03-25 01:23:48

107

Views

Is probability heavily related to graph theory?

Published on 25 Mar 2026 - 1:23

score 38 · Answer 14 · 2026-04-06 21:50:12

38

Views

Number of rows which will evaluate to be true

Published on 06 Apr 2026 - 21:50

score 421 · Answer 15 · 2026-03-25 21:01:34

421

Views

${3^n\choose k}$ is divisible by $3$?

Published on 25 Mar 2026 - 21:01

List Question

Additional properties of finite series that have the property: $\sum a_k = -\sum \frac{a_k}{k}$

how many ways can all 10 different prizes be given to the 6 consolation winners so that 1 gets 3 prizes, 2 get 2 prizes each, and 3 get 1 prize each?

Total number of leaves binary tree with n internal nodes

An interesting series converging to a constant

There is two triangles with common edge in graph $\Gamma$

Number of antisymmetric relationships in set

Proving a combinatorial identity: $\sum_{i=0}^m \binom{l}{i}\binom{m+n-l}{m-i} = \binom{m+n}{m}$

How many $n$ length vector can be?

A password with 7 digits

How many numbers $x$ less than $30030$ are there such that $30030$ divides $x^3-1$

Calculate the number of ways for random walk

The outcome of a hidden coin, given evidence about total heads across all coins

Is probability heavily related to graph theory?

Number of rows which will evaluate to be true

${3^n\choose k}$ is divisible by $3$?

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