Question

Showing that two combinatorial expressions are equal

score 113 · Answer 1 · 2019-10-05 14:05:17

113

Views

Showing that two combinatorial expressions are equal

Published on 05 Oct 2019 - 14:05

score 108 · Answer 2 · 2019-10-06 23:11:58

108

Views

What is the general method to find an asymptotic formula for alternating sums

Published on 06 Oct 2019 - 23:11

score 72 · Answer 3 · 2019-10-07 12:11:59

72

Views

Inclusion–exclusion principle on multiple set maximum value?

Published on 07 Oct 2019 - 12:11

score 525 · Answer 4 · 2019-10-10 10:40:47

525

Views

Proving The (Kind-Of) Inclusion-Exclusion Principle

Published on 10 Oct 2019 - 10:40

score 1.8k · Answer 5 · 2019-10-16 03:37:54

1.8k

Views

175 speak German ,150 French, 180 English, 160 Japanese. How many speak all of them?

Published on 16 Oct 2019 - 3:37

score 119 · Answer 6 · 2019-10-17 23:09:54

119

Views

Class of 100 students, 10 who speak German, 20 who speak Italian, 30 who speak Spanish, 8 who speak both Italian and Spanish, 3 speak all 3 languages

Published on 17 Oct 2019 - 23:09

score 230 · Answer 7 · 2026-03-25 17:40:32

230

Views

How many species of regular 100-sided polygons are there?

Published on 25 Mar 2026 - 17:40

score 159 · Answer 8 · 2019-10-23 22:38:49

159

Views

Counting the ways on grid if one can move from $(x,y)$ to $(x+a, x+b)$ for arbitrary $x,y,a,b\geq 0$.

Published on 23 Oct 2019 - 22:38

score 1k · Answer 9 · 2019-10-25 01:04:41

1k

Views

How many integers from $1 \to 10^{10}$ are not perfect squares, cubes, or fifth powers?

Published on 25 Oct 2019 - 1:04

score 233 · Answer 10 · 2019-10-27 07:42:04

233

Views

Counting number of arrangements for a string, with conditions

Published on 27 Oct 2019 - 7:42

score 218 · Answer 11 · 2019-10-27 16:29:47

218

Views

The principle of inclusion and exclusion: How many permutations of the set $\{1, 2,. . . , 8\}$ do not leave any even number in its place?

Published on 27 Oct 2019 - 16:29

score 34 · Answer 12 · 2019-10-27 16:41:51

34

Views

Explanation upon Positive integer solution (Topic: Inclusion-Exlusion)

Published on 27 Oct 2019 - 16:41

score 40 · Answer 13 · 2019-10-28 19:28:03

40

Views

Using Möbius inversion to count primtive vectors in $\mathbb{Z}^n$

Published on 28 Oct 2019 - 19:28

score 95 · Answer 14 · 2019-10-31 19:11:59

95

Views

How many numbers are divisible by?

Published on 31 Oct 2019 - 19:11

score 296 · Answer 15 · 2019-11-03 16:45:48

296

Views

Use the principle of inclusion-exclusion to find the number of integer partitions of n in which exactly one of 4,7 and 13 is a part

Published on 03 Nov 2019 - 16:45

List Question

Showing that two combinatorial expressions are equal

What is the general method to find an asymptotic formula for alternating sums

Inclusion–exclusion principle on multiple set maximum value?

Proving The (Kind-Of) Inclusion-Exclusion Principle

175 speak German ,150 French, 180 English, 160 Japanese. How many speak all of them?

Class of 100 students, 10 who speak German, 20 who speak Italian, 30 who speak Spanish, 8 who speak both Italian and Spanish, 3 speak all 3 languages

How many species of regular 100-sided polygons are there?

Counting the ways on grid if one can move from $(x,y)$ to $(x+a, x+b)$ for arbitrary $x,y,a,b\geq 0$.

How many integers from $1 \to 10^{10}$ are not perfect squares, cubes, or fifth powers?

Counting number of arrangements for a string, with conditions

The principle of inclusion and exclusion: How many permutations of the set $\{1, 2,. . . , 8\}$ do not leave any even number in its place?

Explanation upon Positive integer solution (Topic: Inclusion-Exlusion)

Using Möbius inversion to count primtive vectors in $\mathbb{Z}^n$

How many numbers are divisible by?

Use the principle of inclusion-exclusion to find the number of integer partitions of n in which exactly one of 4,7 and 13 is a part

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