Question

Closed form or limiting form of an expression involving binomial coefficients

score 116 · Answer 1 · 2026-03-25 07:43:35

116

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Closed form or limiting form of an expression involving binomial coefficients

Published on 25 Mar 2026 - 7:43

score 202 · Answer 2 · 2026-04-12 12:04:05

202

Views

Seemingly negative set cardinality in textbook

Published on 12 Apr 2026 - 12:04

score 756 · Answer 3 · 2026-05-01 00:06:17

756

Views

Derangement formula for multisets

Published on 01 May 2026 - 0:06

score 45 · Answer 4 · 2026-04-14 21:20:10

45

Views

Sets of students, unions, complements, intersections

Published on 14 Apr 2026 - 21:20

score 652 · Answer 5 · 2026-04-16 10:50:10

The number of sequences of length $10$ that can be formed with $5$ unique digits containing two of each where no two adjacent elements are alike

score 468 · Answer 6 · 2026-04-14 02:19:40

468

Views

The number of sequences of length $2n$ that can be formed with digits from set $A={1,2, ... ,n}$ and...

Published on 14 Apr 2026 - 2:19

score 889 · Answer 7 · 2026-05-10 15:44:19

889

Views

A quick method to calculate $\phi(270)$ manually without the 'standard' formula

Published on 10 May 2026 - 15:44

score 1.4k · Answer 8 · 2026-04-16 03:12:12

1.4k

Views

How many arrangements of the digits $0,1...9$ are there that do not end with an $8$ and do not begin with a $3$?

Published on 16 Apr 2026 - 3:12

score 3.9k · Answer 9 · 2026-04-17 15:30:18

3.9k

Views

How many integer solutions of $x_1+x_2+x_3+x_4=28$ are there with $-10 \leq x_i \leq 20$?

Published on 17 Apr 2026 - 15:30

score 441 · Answer 10 · 2026-04-09 05:11:14

441

Views

Arrangements of letters using inclusion and exclusion principles

Published on 09 Apr 2026 - 5:11

score 1.9k · Answer 11 · 2026-04-16 11:33:21

1.9k

Views

How many arrangements of the $26$ different letters are there that contain neither the sequence "the" nor the sequence "math"?

Published on 16 Apr 2026 - 11:33

score 142 · Answer 12 · 2026-04-11 00:42:08

142

Views

combinatorial answer using inclusion exclusion principles

Published on 11 Apr 2026 - 0:42

score 90 · Answer 13 · 2026-04-10 06:34:00

90

Views

Inclusion Exclusion principles in combinatorics

Published on 10 Apr 2026 - 6:34

score 368 · Answer 14 · 2026-04-16 00:04:19

368

Views

How many arrangements of the digits $0,1,....,9$ are there that do not end with an $8$ and do not begin with a $3$?

Published on 16 Apr 2026 - 0:04

score 227 · Answer 15 · 2026-04-30 14:46:41

227

Views

exclusion with combinatrics?

Published on 30 Apr 2026 - 14:46

List Question

Closed form or limiting form of an expression involving binomial coefficients

Seemingly negative set cardinality in textbook

Derangement formula for multisets

Sets of students, unions, complements, intersections

The number of sequences of length $10$ that can be formed with $5$ unique digits containing two of each where no two adjacent elements are alike

The number of sequences of length $2n$ that can be formed with digits from set $A={1,2, ... ,n}$ and...

A quick method to calculate $\phi(270)$ manually without the 'standard' formula

How many arrangements of the digits $0,1...9$ are there that do not end with an $8$ and do not begin with a $3$?

How many integer solutions of $x_1+x_2+x_3+x_4=28$ are there with $-10 \leq x_i \leq 20$?

Arrangements of letters using inclusion and exclusion principles

How many arrangements of the $26$ different letters are there that contain neither the sequence "the" nor the sequence "math"?

combinatorial answer using inclusion exclusion principles

Inclusion Exclusion principles in combinatorics

How many arrangements of the digits $0,1,....,9$ are there that do not end with an $8$ and do not begin with a $3$?

exclusion with combinatrics?

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