Question

Proving the Hockey Stick Identity with the Summation Identity

score 57 · Answer 1 · 2026-03-26 04:34:20

57

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Proving the Hockey Stick Identity with the Summation Identity

Published on 26 Mar 2026 - 4:34

score 240 · Answer 2 · 2026-04-12 17:12:48

240

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counting non-negative integers <100000 (studying for intro discrete math exam)

Published on 12 Apr 2026 - 17:12

score 102 · Answer 3 · 2026-04-14 10:39:21

102

Views

Possible combinations of permutations between N variable-size sets without repetition

Published on 14 Apr 2026 - 10:39

score 95 · Answer 4 · 2026-04-15 03:41:16

95

Views

How many functions $ f : A \rightarrow A$ can be defined such that $\text{f(1) < f(2) < f(3)?}$

Published on 15 Apr 2026 - 3:41

score 717 · Answer 5 · 2026-04-12 04:30:45

717

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Upper-triangular matrices as semidirect product

Published on 12 Apr 2026 - 4:30

score 231 · Answer 6 · 2026-04-12 15:51:59

231

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Probability of winning at least several raffle tickets

Published on 12 Apr 2026 - 15:51

score 342 · Answer 7 · 2026-04-12 00:36:51

342

Views

Visualizing combinations with repetitions allowed.

Published on 12 Apr 2026 - 0:36

score 229 · Answer 8 · 2026-03-26 12:53:43

229

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How to prove the binomial identity $\binom{n}{r - 1} + 2\binom{n}{r} + \binom{n}{r + 1} = \binom{n + 2}{r + 1}$?

Published on 26 Mar 2026 - 12:53

score 139 · Answer 9 · 2026-04-15 05:19:55

139

Views

Combinatorics: Coloring a prism

Published on 15 Apr 2026 - 5:19

score 79 · Answer 10 · 2026-04-15 08:35:12

79

Views

Prove that a graph has no more than $n+n^{4/3}$ edges.

Published on 15 Apr 2026 - 8:35

score 144 · Answer 11 · 2026-04-14 19:42:01

144

Views

The distance on a graph

Published on 14 Apr 2026 - 19:42

score 44 · Answer 12 · 2026-04-13 10:13:04

44

Views

Discrete variables with constraint on sum - How many possible cases?

Published on 13 Apr 2026 - 10:13

score 502 · Answer 13 · 2026-04-13 07:39:04

502

Views

Decomposition of universal enveloping algebra of the general linear Lie algebra

Published on 13 Apr 2026 - 7:39

score 454 · Answer 14 · 2026-04-14 07:05:39

454

Views

Combinatorics problem: probability of picking balls of $K$ different colours

Published on 14 Apr 2026 - 7:05

score 62 · Answer 15 · 2026-03-29 11:06:51

62

Views

Find the number of $7$-tuples such that all elements are distinct and $x_{i}∈ ℤ_{≥0}$. Such that $x_{1}+x_{2}+x_{3}+......+x_{7}=36$

Published on 29 Mar 2026 - 11:06

List Question

Proving the Hockey Stick Identity with the Summation Identity

counting non-negative integers <100000 (studying for intro discrete math exam)

Possible combinations of permutations between N variable-size sets without repetition

How many functions $ f : A \rightarrow A$ can be defined such that $\text{f(1) < f(2) < f(3)?}$

Upper-triangular matrices as semidirect product

Probability of winning at least several raffle tickets

Visualizing combinations with repetitions allowed.

How to prove the binomial identity $\binom{n}{r - 1} + 2\binom{n}{r} + \binom{n}{r + 1} = \binom{n + 2}{r + 1}$?

Combinatorics: Coloring a prism

Prove that a graph has no more than $n+n^{4/3}$ edges.

The distance on a graph

Discrete variables with constraint on sum - How many possible cases?

Decomposition of universal enveloping algebra of the general linear Lie algebra

Combinatorics problem: probability of picking balls of $K$ different colours

Find the number of $7$-tuples such that all elements are distinct and $x_{i}∈ ℤ_{≥0}$. Such that $x_{1}+x_{2}+x_{3}+......+x_{7}=36$

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