Question

Equality of combinations

score 221 · Answer 1 · 2019-04-25 16:51:27

221

Views

Equality of combinations

Published on 25 Apr 2019 - 16:51

score 58 · Answer 2 · 2019-04-25 17:56:10

58

Views

Notation - questions like - How much more probable is getting 5 heads and 5 tails than 9 heads and 1 tail?

Published on 25 Apr 2019 - 17:56

score 179 · Answer 3 · 2019-04-25 17:58:21

179

Views

Probability that n sequences agree in a certain percentage of them

Published on 25 Apr 2019 - 17:58

score 275 · Answer 4 · 2019-04-25 20:39:32

275

Views

25 pebbles are placed in a 5 by 5 grid. How many ways can the pebbles be picked so that no two of them are in the same row or column?

Published on 25 Apr 2019 - 20:39

score 399 · Answer 5 · 2019-04-25 22:47:35

399

Views

Number of ways to place k 2x2 squares in a nxn grid

Published on 25 Apr 2019 - 22:47

score 88 · Answer 6 · 2019-04-26 01:09:05

88

Views

Combination with repetition and no repetition

Published on 26 Apr 2019 - 1:09

score 60 · Answer 7 · 2026-03-29 20:06:18

60

Views

Simple upper bound of sum of first m combinations

Published on 29 Mar 2026 - 20:06

score 328 · Answer 8 · 2026-03-28 14:27:19

328

Views

There are exactly $3^n$ possible monomials of $n$ Boolean variables?

Published on 28 Mar 2026 - 14:27

score 149 · Answer 9 · 2019-04-29 11:36:09

149

Views

What is the probability that $^{\text{n}}\text{C}_{7}$ is divisible by $12$?

Published on 29 Apr 2019 - 11:36

score 147 · Answer 10 · 2026-03-30 03:37:29

147

Views

Defining generalized "permutation coefficients" (in the vein of generalized binomial coefficients)

Published on 30 Mar 2026 - 3:37

score 78 · Answer 11 · 2026-03-25 03:22:11

78

Views

If I am dealt Q♢ K♢ 7♠ 3♢ 5♠ and hold the Q♢ and K♢, how do I calculate the number of possible hands that yield 1 pair of Jacks or Better?

Published on 25 Mar 2026 - 3:22

score 51 · Answer 12 · 2019-05-02 14:44:02

51

Views

Is impossible to put edges between $H_1$ and $H_2$ in such a way as to produce a $(3, 6)$-graph

Published on 02 May 2019 - 14:44

score 101 · Answer 13 · 2019-05-02 15:44:33

101

Views

Number of ways books may be chosen if a particular must be chosen by at least $20$ students? at most $20$ students?

Published on 02 May 2019 - 15:44

score 326 · Answer 14 · 2019-05-03 02:43:36

326

Views

Combinatorics/counting with an alphabet of 4 characters

Published on 03 May 2019 - 2:43

score 87 · Answer 15 · 2019-05-03 13:57:37

87

Views

How many positive integers solutions does $x + y + z + w = 16$ have if $x < y$

Published on 03 May 2019 - 13:57

List Question

Equality of combinations

Notation - questions like - How much more probable is getting 5 heads and 5 tails than 9 heads and 1 tail?

Probability that n sequences agree in a certain percentage of them

25 pebbles are placed in a 5 by 5 grid. How many ways can the pebbles be picked so that no two of them are in the same row or column?

Number of ways to place k 2x2 squares in a nxn grid

Combination with repetition and no repetition

Simple upper bound of sum of first m combinations

There are exactly $3^n$ possible monomials of $n$ Boolean variables?

What is the probability that $^{\text{n}}\text{C}_{7}$ is divisible by $12$?

Defining generalized "permutation coefficients" (in the vein of generalized binomial coefficients)

If I am dealt Q♢ K♢ 7♠ 3♢ 5♠ and hold the Q♢ and K♢, how do I calculate the number of possible hands that yield 1 pair of Jacks or Better?

Is impossible to put edges between $H_1$ and $H_2$ in such a way as to produce a $(3, 6)$-graph

Number of ways books may be chosen if a particular must be chosen by at least $20$ students? at most $20$ students?

Combinatorics/counting with an alphabet of 4 characters

How many positive integers solutions does $x + y + z + w = 16$ have if $x < y$

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