Question

How many students correctly answered all three tasks?

score 60 · Answer 1 · 2022-11-15 20:27:10

60

Views

How many students correctly answered all three tasks?

Published on 15 Nov 2022 - 20:27

score 31 · Answer 2 · 2022-11-17 15:45:41

31

Views

Principle of inclusion exclusion given only a lower bound on the size of intersections

Published on 17 Nov 2022 - 15:45

score 67 · Answer 3 · 2022-11-19 09:04:56

67

Views

Finding the total number of ways of rolling exactly one 1, exactly one 2, or exactly one 6 when rolling a die three times

Published on 19 Nov 2022 - 9:04

score 147 · Answer 4 · 2022-11-19 09:42:02

147

Views

How many solutions are there to the equation?

Published on 19 Nov 2022 - 9:42

score 79 · Answer 5 · 2022-11-22 21:45:22

79

Views

100 people in 20 rooms

Published on 22 Nov 2022 - 21:45

score 58 · Answer 6 · 2022-11-24 12:40:28

58

Views

A different version of inclusion-exclusion theorem, that seems completely unrelated to it...

Published on 24 Nov 2022 - 12:40

score 69 · Answer 7 · 2026-03-28 06:41:49

69

Views

What is the number of series $(x_1,x_2,x_3,x_4,x_5,x_6,x_7) \in \{0,1,2\}^7$ that do not contain the sequence $010$ in any three consecutive places?

Published on 28 Mar 2026 - 6:41

score 86 · Answer 8 · 2022-11-29 11:01:03

86

Views

Why use Inclusion-Exclusion principle

Published on 29 Nov 2022 - 11:01

score 166 · Answer 9 · 2026-03-26 22:55:20

166

Views

The number of placement of $n$ pieces on the chessboard of $n\times n$, such that the piece $k$ cannot be placed in the $k$-th row nor $k$-th column

Published on 26 Mar 2026 - 22:55

score 134 · Answer 10 · 2022-12-31 07:30:51

134

Views

How to proceed in this method to solve this combinatorics question?

Published on 31 Dec 2022 - 7:30

score 84 · Answer 11 · 2022-12-31 19:38:56

84

Views

Generalized sum of distinct integers $ \sum_{\stackrel{a_1,a_2,\ldots, a_n>0}{\text{all distinct}}} 2^{-\sum a_j} $

Published on 31 Dec 2022 - 19:38

score 126 · Answer 12 · 2023-01-03 20:41:01

126

Views

How do I prove this statement about the cardinalities of finite sets without using the inclusion-exclusion principle?

Published on 03 Jan 2023 - 20:41

score 67 · Answer 13 · 2023-01-09 09:10:49

67

Views

In how many ways to NOT take a red ball in an urn?

Published on 09 Jan 2023 - 9:10

score 80 · Answer 14 · 2026-02-23 22:15:52

80

Views

Binary strings using inclusion-exclusion

Published on 23 Feb 2026 - 22:15

score 156 · Answer 15 · 2023-01-12 23:57:48

156

Views

How to find the probability that the permutation does not have adjacent digits?

Published on 12 Jan 2023 - 23:57

List Question

How many students correctly answered all three tasks?

Principle of inclusion exclusion given only a lower bound on the size of intersections

Finding the total number of ways of rolling exactly one 1, exactly one 2, or exactly one 6 when rolling a die three times

How many solutions are there to the equation?

100 people in 20 rooms

A different version of inclusion-exclusion theorem, that seems completely unrelated to it...

What is the number of series $(x_1,x_2,x_3,x_4,x_5,x_6,x_7) \in \{0,1,2\}^7$ that do not contain the sequence $010$ in any three consecutive places?

Why use Inclusion-Exclusion principle

The number of placement of $n$ pieces on the chessboard of $n\times n$, such that the piece $k$ cannot be placed in the $k$-th row nor $k$-th column

How to proceed in this method to solve this combinatorics question?

Generalized sum of distinct integers $ \sum_{\stackrel{a_1,a_2,\ldots, a_n>0}{\text{all distinct}}} 2^{-\sum a_j} $

How do I prove this statement about the cardinalities of finite sets without using the inclusion-exclusion principle?

In how many ways to NOT take a red ball in an urn?

Binary strings using inclusion-exclusion

How to find the probability that the permutation does not have adjacent digits?

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