Question

Finding number of arrays such that first and last elements are same with unequal adjacent elements.

score 41 · Answer 1 · 2020-12-19 11:05:12

41

Views

Finding number of arrays such that first and last elements are same with unequal adjacent elements.

Published on 19 Dec 2020 - 11:05

score 230 · Answer 2 · 2020-12-20 15:49:26

230

Views

Proof of Inclusion Exclusion Principle

Published on 20 Dec 2020 - 15:49

score 405 · Answer 3 · 2020-12-20 20:29:15

405

Views

Find rook polynomial for a full $n\times n$ board

Published on 20 Dec 2020 - 20:29

score 200 · Answer 4 · 2026-04-04 03:32:32

200

Views

Inclusion–exclusion principle, password combinations

Published on 04 Apr 2026 - 3:32

score 131 · Answer 5 · 2020-12-23 19:15:50

131

Views

Can someone help me with this sets question? (How many students knew no coding language?)

Published on 23 Dec 2020 - 19:15

score 30 · Answer 6 · 2020-12-24 06:59:40

30

Views

How to denote an equal frequency of common subsequences in two sequences?

Published on 24 Dec 2020 - 6:59

score 63 · Answer 7 · 2020-12-30 21:00:37

63

Views

NIMO April 2017 conditional probability / PIE system

Published on 30 Dec 2020 - 21:00

score 722 · Answer 8 · 2021-01-01 18:46:01

722

Views

How many integers between $1$ and $1000$ are divisible by $2, 4,$ or $7?$

Published on 01 Jan 2021 - 18:46

score 615 · Answer 9 · 2021-01-05 11:22:16

615

Views

How many ways are there of creating an $8$ character password with a digit, a lowercase letter, and $2$ capital letters?

Published on 05 Jan 2021 - 11:22

score 46 · Answer 10 · 2021-01-08 09:25:37

46

Views

Divide $n > 10$ distinct elements $\{1,2, \dots, n\}$ to $3$ distinct sets $A,B,C$ where $|A|=5$ and $|B|>|C|$

Published on 08 Jan 2021 - 9:25

score 36 · Answer 11 · 2021-01-10 23:12:31

36

Views

Proof for $I \in \binom {[r]}{k}$ with $k \in \mathbb{N_0}$ there exist exactly $(r-k)^n$ r-tuples $(X_1, ..., X_r)$

Published on 10 Jan 2021 - 23:12

score 153 · Answer 12 · 2021-01-14 15:06:01

153

Views

How many permutations of numbers $(1,2,3, .., n)$ are there in which at least $2$ elements are in their original place?

Published on 14 Jan 2021 - 15:06

score 53 · Answer 13 · 2021-01-17 18:09:24

53

Views

Different ways to prepare 5 dishes

Published on 17 Jan 2021 - 18:09

score 161 · Answer 14 · 2021-01-18 21:33:29

161

Views

How Many Positive Integers Below $201$ Are Multiples of $4$ But Not Multiples of $10$?

Published on 18 Jan 2021 - 21:33

score 147 · Answer 15 · 2026-03-27 15:16:15

147

Views

Combinatorics - letters forbidden sequence.

Published on 27 Mar 2026 - 15:16

List Question

Finding number of arrays such that first and last elements are same with unequal adjacent elements.

Proof of Inclusion Exclusion Principle

Find rook polynomial for a full $n\times n$ board

Inclusion–exclusion principle, password combinations

Can someone help me with this sets question? (How many students knew no coding language?)

How to denote an equal frequency of common subsequences in two sequences?

NIMO April 2017 conditional probability / PIE system

How many integers between $1$ and $1000$ are divisible by $2, 4,$ or $7?$

How many ways are there of creating an $8$ character password with a digit, a lowercase letter, and $2$ capital letters?

Divide $n > 10$ distinct elements $\{1,2, \dots, n\}$ to $3$ distinct sets $A,B,C$ where $|A|=5$ and $|B|>|C|$

Proof for $I \in \binom {[r]}{k}$ with $k \in \mathbb{N_0}$ there exist exactly $(r-k)^n$ r-tuples $(X_1, ..., X_r)$

How many permutations of numbers $(1,2,3, .., n)$ are there in which at least $2$ elements are in their original place?

Different ways to prepare 5 dishes

How Many Positive Integers Below $201$ Are Multiples of $4$ But Not Multiples of $10$?

Combinatorics - letters forbidden sequence.

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