Question

Probability of not guessing any number in lotto drawing 7/34

score 157 · Answer 1 · 2026-04-09 10:08:05

157

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Probability of not guessing any number in lotto drawing 7/34

Published on 09 Apr 2026 - 10:08

score 113 · Answer 2 · 2026-05-10 20:03:47

113

Views

Calculate the number of nonnegative integer solutions of $ax+by\leq c$.

Published on 10 May 2026 - 20:03

score 28 · Answer 3 · 2026-04-26 03:19:51

28

Views

Combinatorics 2 variables

Published on 26 Apr 2026 - 3:19

score 297 · Answer 4 · 2026-04-13 15:30:11

297

Views

How many ways to place three distinguishable tokens on the white spaces of a $4$-by-$4$ chess board?

Published on 13 Apr 2026 - 15:30

score 4.8k · Answer 5 · 2026-04-14 23:22:46

4.8k

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Combinatorial proof of $\binom{3n}{3} =3\binom{n}{3} +6n\binom{n}{2} +n^3$?

Published on 14 Apr 2026 - 23:22

score 31 · Answer 6 · 2026-04-14 03:03:24

31

Views

Number of $3$-digit numbers after getting rid of permutations

Published on 14 Apr 2026 - 3:03

score 16 · Answer 7 · 2026-04-15 07:32:15

16

Views

Write each element of a set as a sum of the combinations of the elements of another set

Published on 15 Apr 2026 - 7:32

score 58 · Answer 8 · 2026-05-10 20:39:02

58

Views

Bounds on $d$ for tiling $\mathbb{Z}^d$ with subset of $\mathbb{Z}^n$?

Published on 10 May 2026 - 20:39

score 159 · Answer 9 · 2026-04-14 00:27:22

159

Views

Intuitive Explanation to Transfer Coin Combinations to Urn Model Combinations

Published on 14 Apr 2026 - 0:27

score 95 · Answer 10 · 2026-04-10 23:45:19

95

Views

Permutations with restrictions (3 characters and 2 can't be together)

Published on 10 Apr 2026 - 23:45

score 100 · Answer 11 · 2026-05-10 21:50:11

100

Views

Find an explicit formula (as explicit as possible) for $a_k$

Published on 10 May 2026 - 21:50

score 33 · Answer 12 · 2026-04-15 21:27:14

33

Views

Creating a set of randomized ordered pairs from a list while excluding specified pairs

Published on 15 Apr 2026 - 21:27

score 153 · Answer 13 · 2026-04-14 22:04:22

153

Views

Dice roll combinations in Monopoly with doubles, using total combinations and sums of dice

Published on 14 Apr 2026 - 22:04

score 484 · Answer 14 · 2026-04-15 17:06:00

484

Views

Number of permutations? (2 groups of n elements with a condition)

Published on 15 Apr 2026 - 17:06

score 89 · Answer 15 · 2026-04-15 20:54:15

89

Views

Show that $\sum_{k=1}^n k^2 {n\choose k} = n(n+1)2^{n-2}$.

Published on 15 Apr 2026 - 20:54

List Question

Probability of not guessing any number in lotto drawing 7/34

Calculate the number of nonnegative integer solutions of $ax+by\leq c$.

Combinatorics 2 variables

How many ways to place three distinguishable tokens on the white spaces of a $4$-by-$4$ chess board?

Combinatorial proof of $\binom{3n}{3} =3\binom{n}{3} +6n\binom{n}{2} +n^3$?

Number of $3$-digit numbers after getting rid of permutations

Write each element of a set as a sum of the combinations of the elements of another set

Bounds on $d$ for tiling $\mathbb{Z}^d$ with subset of $\mathbb{Z}^n$?

Intuitive Explanation to Transfer Coin Combinations to Urn Model Combinations

Permutations with restrictions (3 characters and 2 can't be together)

Find an explicit formula (as explicit as possible) for $a_k$

Creating a set of randomized ordered pairs from a list while excluding specified pairs

Dice roll combinations in Monopoly with doubles, using total combinations and sums of dice

Number of permutations? (2 groups of n elements with a condition)

Show that $\sum_{k=1}^n k^2 {n\choose k} = n(n+1)2^{n-2}$.

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