Question

Number of possibilities to seat $3$ pairs of husbands and wives so that at least one husband and wife sit together

score 171 · Answer 1 · 2026-03-26 14:12:12

171

Views

Number of possibilities to seat $3$ pairs of husbands and wives so that at least one husband and wife sit together

Published on 26 Mar 2026 - 14:12

score 56 · Answer 2 · 2026-03-25 06:06:21

56

Views

What is the probability of pulling out at least 2 hearts consecutively, having 3 extractions with replacement out of a complete deck?

Published on 25 Mar 2026 - 6:06

score 441 · Answer 3 · 2026-03-24 23:45:09

441

Views

Mysterious Characterization of $A_5$ inside $S_5$

Published on 24 Mar 2026 - 23:45

score 6.3k · Answer 4 · 2018-01-23 17:31:05

6.3k

Views

How many number with 4 digits, beginning with $1$ and have exactly two identical digits?

Published on 23 Jan 2018 - 17:31

score 528 · Answer 5 · 2026-03-23 00:07:46

528

Views

Why does the multinomial coefficient count the same numbers as the combination coefficient?

Published on 23 Mar 2026 - 0:07

score 339 · Answer 6 · 2026-03-25 06:04:33

339

Views

Calculate $\sum_{k=1}^{10}k{{10}\choose{k}}{{20}\choose{10-k}}$

Published on 25 Mar 2026 - 6:04

score 189 · Answer 7 · 2026-03-12 04:52:00

189

Views

Hard Combinatorical Geometric Problem on Intersecting Circles

Published on 12 Mar 2026 - 4:52

score 955 · Answer 8 · 2026-03-25 11:46:54

955

Views

Counting problem involving inclusion-exclusion principle

Published on 25 Mar 2026 - 11:46

score 190 · Answer 9 · 2018-01-23 21:53:47

190

Views

Simplifying $S=\binom{n}{0}-\binom{n}{1}+\binom{n}{2}-...+(-1)^r\binom{n}{r}$

Published on 23 Jan 2018 - 21:53

score 76 · Answer 10 · 2026-03-25 06:22:09

76

Views

Suppose 3 people are each dealt 2 cards from a standard deck of playing cards

Published on 25 Mar 2026 - 6:22

score 53 · Answer 11 · 2018-01-24 00:01:40

53

Views

Choosing n numbers from a set and finding their sum

Published on 24 Jan 2018 - 0:01

score 49 · Answer 12 · 2018-01-24 00:46:07

49

Views

Is it possible to minimize pairs when creating sets with elements of different classes?

Published on 24 Jan 2018 - 0:46

score 2.2k · Answer 13 · 2026-03-25 06:21:18

2.2k

Views

How many unique subsets of size 3 can there be from a 5 element set?

Published on 25 Mar 2026 - 6:21

score 161 · Answer 14 · 2026-03-25 04:43:42

161

Views

For sets $A_1, \ldots, A_k$, with $n^2$ different elements, $|A_i| \geq 2n$, and every set pair $A_i, A_j$ shares at most 1 element, show $k \leq n$

Published on 25 Mar 2026 - 4:43

score 95 · Answer 15 · 2026-03-20 06:30:30

95

Views

Obtaining central coefficients from bivariate generating function

Published on 20 Mar 2026 - 6:30

List Question

Number of possibilities to seat $3$ pairs of husbands and wives so that at least one husband and wife sit together

What is the probability of pulling out at least 2 hearts consecutively, having 3 extractions with replacement out of a complete deck?

Mysterious Characterization of $A_5$ inside $S_5$

How many number with 4 digits, beginning with $1$ and have exactly two identical digits?

Why does the multinomial coefficient count the same numbers as the combination coefficient?

Calculate $\sum_{k=1}^{10}k{{10}\choose{k}}{{20}\choose{10-k}}$

Hard Combinatorical Geometric Problem on Intersecting Circles

Counting problem involving inclusion-exclusion principle

Simplifying $S=\binom{n}{0}-\binom{n}{1}+\binom{n}{2}-...+(-1)^r\binom{n}{r}$

Suppose 3 people are each dealt 2 cards from a standard deck of playing cards

Choosing n numbers from a set and finding their sum

Is it possible to minimize pairs when creating sets with elements of different classes?

How many unique subsets of size 3 can there be from a 5 element set?

For sets $A_1, \ldots, A_k$, with $n^2$ different elements, $|A_i| \geq 2n$, and every set pair $A_i, A_j$ shares at most 1 element, show $k \leq n$

Obtaining central coefficients from bivariate generating function

Trending Questions

Popular # Hahtags

Popular Questions