Question

How many six digit numbers are even or are divisible by 5?

score 281 · Answer 1 · 2023-08-16 09:33:07

281

Views

How many six digit numbers are even or are divisible by 5?

Published on 16 Aug 2023 - 9:33

score 188 · Answer 2 · 2023-08-16 19:35:28

188

Views

Re-arrangements of $(1,1,2,2,3,3,4,4)$ with $(1,2,3,4)$ as a subsequence

Published on 16 Aug 2023 - 19:35

score 115 · Answer 3 · 2026-02-23 13:42:42

115

Views

Counting $\{a,a,b,b,c,c,d,d,d \}$ derangements.

Published on 23 Feb 2026 - 13:42

score 404 · Answer 4 · 2023-08-27 12:55:29

404

Views

Permutation question on arrangement of 6 objects, grouped in pairs of 2, in 2 rows with 3 spaces in each row.

Published on 27 Aug 2023 - 12:55

score 222 · Answer 5 · 2023-08-30 10:41:27

222

Views

Inclusion-exclusion solution to a probability problem about lotteries

Published on 30 Aug 2023 - 10:41

score 59 · Answer 6 · 2026-02-23 22:37:31

59

Views

Chance that all $k$ bins are filled by $n≥k$ balls without using PIE

Published on 23 Feb 2026 - 22:37

score 132 · Answer 7 · 2026-03-28 09:45:37

132

Views

Exercise 2 Stanley combinatorics volume 1: Bijective proof of a sum equality

Published on 28 Mar 2026 - 9:45

score 102 · Answer 8 · 2023-09-10 02:08:41

102

Views

In how many ways can we seat 5 pairs of twins in a row of 10 chairs, such that nobody sits next to his or her twin?

Published on 10 Sep 2023 - 2:08

score 50 · Answer 9 · 2023-09-11 04:00:34

50

Views

How to explain this problem in terms of inclusion exclusion?

Published on 11 Sep 2023 - 4:00

score 63 · Answer 10 · 2023-09-15 20:00:16

63

Views

How many six digit numbers are there containing digits from $\{1,...,9\}$ in which no digit appears more than three times?

Published on 15 Sep 2023 - 20:00

score 81 · Answer 11 · 2023-09-16 18:15:36

81

Views

Union of sets formula

Published on 16 Sep 2023 - 18:15

score 78 · Answer 12 · 2023-09-29 21:13:55

78

Views

Find the number of numbers with 5 digits that don't have the sequence 17 within them

Published on 29 Sep 2023 - 21:13

score 44 · Answer 13 · 2023-10-11 18:59:42

44

Views

Number of surjections from from a set of size $m$ onto a set of size $n$ using inclusion exclusion techniques

Published on 11 Oct 2023 - 18:59

score 100 · Answer 14 · 2026-02-23 04:22:29

100

Views

How many subsets $S$ of integer interval $[0,n]$ such that $n, n-1 \not \in S+S$?

Published on 23 Feb 2026 - 4:22

score 90 · Answer 15 · 2023-10-14 12:44:32

There are $\mathrm{400}$ identical seats to be distributed among $\mathrm{3}$ parties such that each party has at most $\mathrm{200}$ seats

List Question

How many six digit numbers are even or are divisible by 5?

Re-arrangements of $(1,1,2,2,3,3,4,4)$ with $(1,2,3,4)$ as a subsequence

Counting $\{a,a,b,b,c,c,d,d,d \}$ derangements.

Permutation question on arrangement of 6 objects, grouped in pairs of 2, in 2 rows with 3 spaces in each row.

Inclusion-exclusion solution to a probability problem about lotteries

Chance that all $k$ bins are filled by $n≥k$ balls without using PIE

Exercise 2 Stanley combinatorics volume 1: Bijective proof of a sum equality

In how many ways can we seat 5 pairs of twins in a row of 10 chairs, such that nobody sits next to his or her twin?

How to explain this problem in terms of inclusion exclusion?

How many six digit numbers are there containing digits from $\{1,...,9\}$ in which no digit appears more than three times?

Union of sets formula

Find the number of numbers with 5 digits that don't have the sequence 17 within them

Number of surjections from from a set of size $m$ onto a set of size $n$ using inclusion exclusion techniques

How many subsets $S$ of integer interval $[0,n]$ such that $n, n-1 \not \in S+S$?

There are $\mathrm{400}$ identical seats to be distributed among $\mathrm{3}$ parties such that each party has at most $\mathrm{200}$ seats

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