Question

How many $n$ digit numbers formed from $n$ digits where a digit can be repeated twice?

score 1.1k · Answer 1 · 2026-04-16 15:37:23

1.1k

Views

How many $n$ digit numbers formed from $n$ digits where a digit can be repeated twice?

Published on 16 Apr 2026 - 15:37

score 53 · Answer 2 · 2026-04-14 04:42:17

53

Views

Prove that $r!=5x+1$ for some $r$ in $\mathbb{N}$ iff $x \in \{0,1\}$

Published on 14 Apr 2026 - 4:42

score 1.4k · Answer 3 · 2026-04-12 10:17:19

1.4k

Views

How to express all group elements in terms of generators in GAP

Published on 12 Apr 2026 - 10:17

score 388 · Answer 4 · 2026-04-12 05:09:09

388

Views

Permutation and combination of identical objects

Published on 12 Apr 2026 - 5:09

score 707 · Answer 5 · 2026-04-13 05:23:00

707

Views

Formulas for different permutation/combination scenarios

Published on 13 Apr 2026 - 5:23

score 429 · Answer 6 · 2026-04-13 05:42:59

429

Views

Determinant of Matrix is Not Zero (combinatorial proof?)

Published on 13 Apr 2026 - 5:42

score 1.9k · Answer 7 · 2026-04-14 18:45:15

1.9k

Views

Number of Ways to Arrange String with Repeated Elements

Published on 14 Apr 2026 - 18:45

score 39 · Answer 8 · 2026-05-01 16:33:20

39

Views

Notation for "permutation moves an element"

Published on 01 May 2026 - 16:33

score 52 · Answer 9 · 2026-04-23 19:28:59

52

Views

Does there exist a $3$-variable word $w$ and $\alpha,\beta,\gamma \in S_n$ with $w(\alpha,\beta,\gamma)=\mathrm{id}$ and three other properties?

Published on 23 Apr 2026 - 19:28

score 188 · Answer 10 · 2026-04-13 12:49:04

188

Views

How to Set Up Card Probability Problem?

Published on 13 Apr 2026 - 12:49

score 3.2k · Answer 11 · 2026-04-15 02:54:41

3.2k

Views

Unique Digit Password Probability Problem

Published on 15 Apr 2026 - 2:54

score 537 · Answer 12 · 2026-04-14 18:57:39

537

Views

Probability that a cycle of a permutation ends at $k$th step

Published on 14 Apr 2026 - 18:57

score 480 · Answer 13 · 2026-04-15 03:00:58

480

Views

Ways to arrange N black and white balls such that no more than 2 consecutive white or black balls

Published on 15 Apr 2026 - 3:00

score 515 · Answer 14 · 2026-04-12 20:52:17

515

Views

Possible Arrangements of the $n$ red balls and $n$ blue balls

Published on 12 Apr 2026 - 20:52

score 142 · Answer 15 · 2026-04-15 02:27:34

142

Views

In how many ways can four students take two exams if none of the students can take both exams at the same time?

Published on 15 Apr 2026 - 2:27

List Question

How many $n$ digit numbers formed from $n$ digits where a digit can be repeated twice?

Prove that $r!=5x+1$ for some $r$ in $\mathbb{N}$ iff $x \in \{0,1\}$

How to express all group elements in terms of generators in GAP

Permutation and combination of identical objects

Formulas for different permutation/combination scenarios

Determinant of Matrix is Not Zero (combinatorial proof?)

Number of Ways to Arrange String with Repeated Elements

Notation for "permutation moves an element"

Does there exist a $3$-variable word $w$ and $\alpha,\beta,\gamma \in S_n$ with $w(\alpha,\beta,\gamma)=\mathrm{id}$ and three other properties?

How to Set Up Card Probability Problem?

Unique Digit Password Probability Problem

Probability that a cycle of a permutation ends at $k$th step

Ways to arrange N black and white balls such that no more than 2 consecutive white or black balls

Possible Arrangements of the $n$ red balls and $n$ blue balls

In how many ways can four students take two exams if none of the students can take both exams at the same time?

Trending Questions

Popular # Hahtags

Popular Questions