Question

Efficient way to count the number of ways to select 3 numbers from a given list has their AND(bit-wise) equal 0

score 101 · Answer 1 · 2026-03-27 04:38:13

101

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Efficient way to count the number of ways to select 3 numbers from a given list has their AND(bit-wise) equal 0

Published on 27 Mar 2026 - 4:38

score 248 · Answer 2 · 2018-12-28 03:22:49

248

Views

Combinatorics - How many orders are possible, from a chef's and waiter's perspective?

Published on 28 Dec 2018 - 3:22

score 105 · Answer 3 · 2026-03-25 13:33:27

105

Views

Number of lines formed from given points

Published on 25 Mar 2026 - 13:33

score 143 · Answer 4 · 2026-03-28 13:59:13

143

Views

Why does $\binom {3} {1} =\binom {3} {2}$?

Published on 28 Mar 2026 - 13:59

score 10.9k · Answer 5 · 2018-12-31 19:44:48

10.9k

Views

If you flip three fair coins, what is the probability that you'll get two tails and one head in any order?

Published on 31 Dec 2018 - 19:44

score 198 · Answer 6 · 2026-03-27 20:19:57

198

Views

Number of functions between two sets, with a constraint on said functions

Published on 27 Mar 2026 - 20:19

score 79 · Answer 7 · 2019-01-01 09:08:22

79

Views

Prove that $ \binom nm \sum_{i=0}^{m} (-1)^i\frac{\binom mi}{n-m+1+i}=\frac{1}{1+n}$

Published on 01 Jan 2019 - 9:08

score 291 · Answer 8 · 2026-03-27 13:03:26

291

Views

Rectangles in a $n \times n$ grid and the sum of the first $n$ cubes: a geometric connection?

Published on 27 Mar 2026 - 13:03

score 1k · Answer 9 · 2019-01-01 17:53:01

Integers $1,2,...,n$ are placed in a way that each value is either bigger or smaller than all preceding values. In how many ways this can be done?

score 51 · Answer 10 · 2019-01-02 16:32:18

51

Views

Mapping between overlapping sets

Published on 02 Jan 2019 - 16:32

score 84 · Answer 11 · 2019-01-03 00:38:34

84

Views

$\sum_{k=1}^{\infty} k {n+k \choose n} p^k$

Published on 03 Jan 2019 - 0:38

score 28 · Answer 12 · 2019-01-03 08:01:58

28

Views

graph theory: minimize the panelty

Published on 03 Jan 2019 - 8:01

score 76 · Answer 13 · 2019-01-04 15:47:42

76

Views

Prove that $\sum_{j=0}^{n}\sum_{i=j}^{n} {^nC_i} {^iC_j}=3^n$

Published on 04 Jan 2019 - 15:47

score 301 · Answer 14 · 2026-03-26 06:02:38

301

Views

Minimum distance between sequence a and all permutations of another sequence b

Published on 26 Mar 2026 - 6:02

score 998 · Answer 15 · 2019-01-04 23:13:23

998

Views

Sum of each combination

Published on 04 Jan 2019 - 23:13

List Question

Efficient way to count the number of ways to select 3 numbers from a given list has their AND(bit-wise) equal 0

Combinatorics - How many orders are possible, from a chef's and waiter's perspective?

Number of lines formed from given points

Why does $\binom {3} {1} =\binom {3} {2}$?

If you flip three fair coins, what is the probability that you'll get two tails and one head in any order?

Number of functions between two sets, with a constraint on said functions

Prove that $ \binom nm \sum_{i=0}^{m} (-1)^i\frac{\binom mi}{n-m+1+i}=\frac{1}{1+n}$

Rectangles in a $n \times n$ grid and the sum of the first $n$ cubes: a geometric connection?

Integers $1,2,...,n$ are placed in a way that each value is either bigger or smaller than all preceding values. In how many ways this can be done?

Mapping between overlapping sets

$\sum_{k=1}^{\infty} k {n+k \choose n} p^k$

graph theory: minimize the panelty

Prove that $\sum_{j=0}^{n}\sum_{i=j}^{n} {^nC_i} {^iC_j}=3^n$

Minimum distance between sequence a and all permutations of another sequence b

Sum of each combination

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