Question

How many $8$-digit numbers do not contain the string $55555$?

score 118 · Answer 1 · 2020-12-22 05:33:25

118

Views

How many $8$-digit numbers do not contain the string $55555$?

Published on 22 Dec 2020 - 5:33

score 75 · Answer 2 · 2020-12-23 11:20:10

75

Views

How many size 10 sequences can be formed with terms in $\{A,B,C\}$ and the number of terms A is odd?

Published on 23 Dec 2020 - 11:20

score 495 · Answer 3 · 2020-12-25 08:31:23

495

Views

Counting $5$-character long Passwords with a Fixed Starting and Ending Points

Published on 25 Dec 2020 - 8:31

score 243 · Answer 4 · 2020-12-25 19:11:52

243

Views

Interesting question regarding generating function on words

Published on 25 Dec 2020 - 19:11

score 291 · Answer 5 · 2020-12-28 02:25:45

291

Views

How many $k$-letter words are there such that the letters A and B are not next to each other?

Published on 28 Dec 2020 - 2:25

score 99 · Answer 6 · 2020-12-30 08:04:15

99

Views

Show: If $C\subseteq\{X,Y\}^*$ is prefix-free and $|C|=2^n$, $\sum\limits_{w\in C}\operatorname{length}(w)\ge n2^n$.

Published on 30 Dec 2020 - 8:04

score 59 · Answer 7 · 2021-01-09 12:42:32

59

Views

What does this pic mean?(guess it's a binary number)

Published on 09 Jan 2021 - 12:42

score 164 · Answer 8 · 2021-01-11 22:51:05

164

Views

Number of binary strings without adjacent char more than $n$

Published on 11 Jan 2021 - 22:51

score 27 · Answer 9 · 2021-01-16 20:20:07

27

Views

How many subsets of length 10 of the Latin alphabet don't contain the set $\{a, b, c, d\}$?

Published on 16 Jan 2021 - 20:20

score 52 · Answer 10 · 2021-01-16 23:09:52

52

Views

Cardinality of equivalence classes in the positive braid semigroup?

Published on 16 Jan 2021 - 23:09

score 48 · Answer 11 · 2021-01-18 12:04:09

48

Views

Elementary combinatorics

Published on 18 Jan 2021 - 12:04

score 37 · Answer 12 · 2021-01-18 13:27:21

37

Views

Number of strings which have given prefix function

Published on 18 Jan 2021 - 13:27

score 509 · Answer 13 · 2021-01-21 07:44:26

509

Views

The Soup Problem: how to asymptotically fairly split a geometric series and a constant one using a single pattern?

Published on 21 Jan 2021 - 7:44

score 146 · Answer 14 · 2021-01-23 15:30:06

146

Views

Combinatorics - letters forbidden sequence.

Published on 23 Jan 2021 - 15:30

score 89 · Answer 15 · 2021-01-26 14:43:38

89

Views

Explicit formula for number of n-digit ternary sequences with no consecutive 2's

Published on 26 Jan 2021 - 14:43

List Question

How many $8$-digit numbers do not contain the string $55555$?

How many size 10 sequences can be formed with terms in $\{A,B,C\}$ and the number of terms A is odd?

Counting $5$-character long Passwords with a Fixed Starting and Ending Points

Interesting question regarding generating function on words

How many $k$-letter words are there such that the letters A and B are not next to each other?

Show: If $C\subseteq\{X,Y\}^*$ is prefix-free and $|C|=2^n$, $\sum\limits_{w\in C}\operatorname{length}(w)\ge n2^n$.

What does this pic mean?(guess it's a binary number)

Number of binary strings without adjacent char more than $n$

How many subsets of length 10 of the Latin alphabet don't contain the set $\{a, b, c, d\}$?

Cardinality of equivalence classes in the positive braid semigroup?

Elementary combinatorics

Number of strings which have given prefix function

The Soup Problem: how to asymptotically fairly split a geometric series and a constant one using a single pattern?

Combinatorics - letters forbidden sequence.

Explicit formula for number of n-digit ternary sequences with no consecutive 2's

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