List questions from combinatorics

Published on 25 Mar 2026 - 6:19

48

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Number of Subsets that Satisfies a Divisibility Condition

Published on 04 Feb 2018 - 18:05

77

Views

How can I prove $\frac{1}{n}\sum\limits_{d|n}\varphi(d)2^{n/d}=2+\sum\limits_{k=1}^{n-1}T(n-k,k)$?

Published on 04 Feb 2018 - 19:02

769

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Problem with poker chips

Published on 04 Feb 2018 - 19:52

190

Views

Graph Theory - Players problem

Published on 26 Mar 2026 - 3:09

266

Views

Parallelograms formed by $m \times n$ parallel lines

Published on 04 Feb 2018 - 20:24

1.4k

Views

Hint for problem on $4 \times 7$-chessboard problem related to pigeonhole principle

Published on 22 Mar 2026 - 13:22

475

Views

How many ways can the cards be shuffled with at least 1 card being in the correct position?

Published on 01 Apr 2026 - 12:51

36

Views

Number of edges in $V_1\times V_2$

Published on 25 Mar 2026 - 22:04

109

Views

Pigeonhole principle subsets

Published on 01 Apr 2026 - 9:49

353

Views

Sum of terms involving binomial coefficients and floor functions

Published on 25 Mar 2026 - 13:01

391

Views

money changing problem

Published on 31 Mar 2026 - 20:54

269

Views

Probability of zero-occurrences of a substring within a string

Published on 05 Feb 2018 - 6:44

45

Views

Is there a scheme by which we can form distinct sums of sums.

Published on 17 Mar 2026 - 22:04

95

Views

A proof in combinatorics (prove by any method)

Published on 25 Mar 2026 - 4:35

List Question

Effective algorithm for subset sum search problem based on decision problem of subset sum

Number of Subsets that Satisfies a Divisibility Condition

How can I prove $\frac{1}{n}\sum\limits_{d|n}\varphi(d)2^{n/d}=2+\sum\limits_{k=1}^{n-1}T(n-k,k)$?

Problem with poker chips

Graph Theory - Players problem

Parallelograms formed by $m \times n$ parallel lines

Hint for problem on $4 \times 7$-chessboard problem related to pigeonhole principle

How many ways can the cards be shuffled with at least 1 card being in the correct position?

Number of edges in $V_1\times V_2$

Pigeonhole principle subsets

Sum of terms involving binomial coefficients and floor functions

money changing problem

Probability of zero-occurrences of a substring within a string

Is there a scheme by which we can form distinct sums of sums.

A proof in combinatorics (prove by any method)

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