Question

Count of $N$ digit numbers with no repeating neighbors

score 140 · Answer 1 · 2018-10-19 05:43:08

140

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Count of $N$ digit numbers with no repeating neighbors

Published on 19 Oct 2018 - 5:43

score 159 · Answer 2 · 2026-03-27 22:18:58

159

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$(2n-1)(2n-3)\cdots 3\cdot1 = \frac{(2n)!}{2^nn!}$

Published on 27 Mar 2026 - 22:18

score 17 · Answer 3 · 2026-03-26 06:09:13

17

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How to form a weighted index using observations from each data columns

Published on 26 Mar 2026 - 6:09

score 724 · Answer 4 · 2018-10-20 04:45:00

724

Views

How many different ways can the cookies be chosen?

Published on 20 Oct 2018 - 4:45

score 79 · Answer 5 · 2018-10-20 06:50:58

79

Views

$\text{det}(A+B)$ is the sum of $\text{det}A$ and a linear combination of minors of $B$.

Published on 20 Oct 2018 - 6:50

score 800 · Answer 6 · 2018-10-20 08:05:06

800

Views

What is the number of arrangements of all the seven letters of the word “EXAMPLE” in which the vowels are all separated?

Published on 20 Oct 2018 - 8:05

score 28 · Answer 7 · 2018-10-21 08:50:22

28

Views

how the following ways of selection differs from each other

Published on 21 Oct 2018 - 8:50

score 41 · Answer 8 · 2018-10-21 20:11:54

In how many ways can a student select $4$ out of $20$ recommended books if exactly $3$ of the $12$ recommended physics books are selected?

score 377 · Answer 9 · 2026-03-26 02:50:20

377

Views

How many different tournament orderings are there?

Published on 26 Mar 2026 - 2:50

score 89 · Answer 10 · 2018-10-22 03:53:36

89

Views

How many different passwords of length $10$ have $3$ A's and $7$ digits such that no two A's are adjacent?

Published on 22 Oct 2018 - 3:53

score 144 · Answer 11 · 2018-10-22 17:25:28

144

Views

What are all the possible combinations when two test items are possible out of four and order matters

Published on 22 Oct 2018 - 17:25

score 162 · Answer 12 · 2018-10-22 18:54:24

162

Views

How many options of a train if it is built from $5$ locomotives and $17$ wagons?

Published on 22 Oct 2018 - 18:54

score 38 · Answer 13 · 2018-10-22 19:17:32

38

Views

How many possibilites of a photo from $25$ people?

Published on 22 Oct 2018 - 19:17

score 43 · Answer 14 · 2026-03-25 20:07:28

43

Views

How do I uniformly sample from sorted combinations

Published on 25 Mar 2026 - 20:07

score 32 · Answer 15 · 2018-10-23 16:10:10

32

Views

Golfing rotations

Published on 23 Oct 2018 - 16:10

List Question

Count of $N$ digit numbers with no repeating neighbors

$(2n-1)(2n-3)\cdots 3\cdot1 = \frac{(2n)!}{2^nn!}$

How to form a weighted index using observations from each data columns

How many different ways can the cookies be chosen?

$\text{det}(A+B)$ is the sum of $\text{det}A$ and a linear combination of minors of $B$.

What is the number of arrangements of all the seven letters of the word “EXAMPLE” in which the vowels are all separated?

how the following ways of selection differs from each other

In how many ways can a student select $4$ out of $20$ recommended books if exactly $3$ of the $12$ recommended physics books are selected?

How many different tournament orderings are there?

How many different passwords of length $10$ have $3$ A's and $7$ digits such that no two A's are adjacent?

What are all the possible combinations when two test items are possible out of four and order matters

How many options of a train if it is built from $5$ locomotives and $17$ wagons?

How many possibilites of a photo from $25$ people?

How do I uniformly sample from sorted combinations

Golfing rotations

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