Question

A set of 12 cards contains 7 red and 5 black

score 114 · Answer 1 · 2026-03-26 12:54:00

A set of 12 cards contains 7 red and 5 black

Published on 26 Mar 2026 - 12:54

score 1k · Answer 2 · 2026-03-28 17:04:56

How many permutations of $\{1, \ldots, n\}$ exist such that none of them contain $(i, i+1)$ (as a sequence) for $i \in {1,...,(n-1)}$?

score 271 · Answer 3 · 2026-03-26 04:29:09

271

Views

What is the Probability Generating Function (PGF) for the "Matching Problem"?

Published on 26 Mar 2026 - 4:29

score 226 · Answer 4 · 2026-03-25 12:54:55

226

Views

How many injective functions from $\{5,6,7,8,9\}$ to itself map $5$ and $6$ to another number?

Published on 25 Mar 2026 - 12:54

score 43 · Answer 5 · 2026-03-25 14:23:52

43

Views

How many functions map a number $x$ to $y$ such that $(x\mod y) = 0$?

Published on 25 Mar 2026 - 14:23

score 41 · Answer 6 · 2026-03-28 17:04:56

41

Views

Probability of a certain number of good parts out of a lot

Published on 28 Mar 2026 - 17:04

score 549 · Answer 7 · 2026-04-09 07:50:03

549

Views

How do I prove the number of derangements formula $nD_{n - 1} + (-1)^n$ intuitively?

Published on 09 Apr 2026 - 7:50

score 1.2k · Answer 8 · 2026-03-25 10:54:22

1.2k

Views

How many Jordan form for given characteristic and minimal polynomials?

Published on 25 Mar 2026 - 10:54

score 65 · Answer 9 · 2018-04-30 20:49:23

65

Views

Number of functions $f : \{1, 2, ..., n\} → \{1, 2, ..., n + 2\}$ satisfying $f (x) < f (y)$

Published on 30 Apr 2018 - 20:49

score 125 · Answer 10 · 2026-04-05 18:23:37

125

Views

Counting Theory - Discrete Math

Published on 05 Apr 2026 - 18:23

score 164 · Answer 11 · 2026-03-26 12:53:29

If two of the $13$ members of a computer programming team refuse to work together, how many groups of seven can be chosen to work on a project?

score 51 · Answer 12 · 2026-04-05 18:24:57

51

Views

Two approaches to a combinatorics question. Why is my answer wrong?

Published on 05 Apr 2026 - 18:24

score 90 · Answer 13 · 2026-03-26 04:50:36

90

Views

Number matching lottery winning probability

Published on 26 Mar 2026 - 4:50

score 25 · Answer 14 · 2018-05-01 06:16:14

25

Views

Is the number of possible $3$ element subsets of set $B$ equal to number of $3$ element selections from $B$?

Published on 01 May 2018 - 6:16

score 135 · Answer 15 · 2026-03-26 12:58:21

135

Views

Writing mathematical expressions for selections and arrangements

Published on 26 Mar 2026 - 12:58

List Question

A set of 12 cards contains 7 red and 5 black

How many permutations of $\{1, \ldots, n\}$ exist such that none of them contain $(i, i+1)$ (as a sequence) for $i \in {1,...,(n-1)}$?

What is the Probability Generating Function (PGF) for the "Matching Problem"?

How many injective functions from $\{5,6,7,8,9\}$ to itself map $5$ and $6$ to another number?

How many functions map a number $x$ to $y$ such that $(x\mod y) = 0$?

Probability of a certain number of good parts out of a lot

How do I prove the number of derangements formula $nD_{n - 1} + (-1)^n$ intuitively?

How many Jordan form for given characteristic and minimal polynomials?

Number of functions $f : \{1, 2, ..., n\} → \{1, 2, ..., n + 2\}$ satisfying $f (x) < f (y)$

Counting Theory - Discrete Math

If two of the $13$ members of a computer programming team refuse to work together, how many groups of seven can be chosen to work on a project?

Two approaches to a combinatorics question. Why is my answer wrong?

Number matching lottery winning probability

Is the number of possible $3$ element subsets of set $B$ equal to number of $3$ element selections from $B$?

Writing mathematical expressions for selections and arrangements

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