Question

Inequality in Frankl's conjecture

score 147 · Answer 1 · 2026-04-01 13:01:01

147

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Inequality in Frankl's conjecture

Published on 01 Apr 2026 - 13:01

score 63 · Answer 2 · 2026-04-01 23:05:31

63

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$\forall n\in\mathbb N,x>-1,(1+x)^n\ge1+nx$ Using 2nd Derivative

Published on 01 Apr 2026 - 23:05

score 94 · Answer 3 · 2026-03-25 06:04:54

94

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Find $\sum_{k=0}^{n}4^k \binom{n}{k}$

Published on 25 Mar 2026 - 6:04

score 409 · Answer 4 · 2026-03-25 05:48:55

409

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How many ways are there to build a tower of 5 cubes height, out of red, yellow, blue, and green cubes, such that:

Published on 25 Mar 2026 - 5:48

score 210 · Answer 5 · 2026-03-25 07:09:51

210

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Show why the equation $F_{2n}=F_{n}^{2}+F_{n-1}^{2}$ is correct by taking an example from the staircase problem

Published on 25 Mar 2026 - 7:09

score 127 · Answer 6 · 2018-02-06 16:21:11

127

Views

Players tournament

Published on 06 Feb 2018 - 16:21

score 528 · Answer 7 · 2026-03-25 13:34:19

528

Views

What is the largest possible number of moves that can be taken to color the whole grid?

Published on 25 Mar 2026 - 13:34

score 407 · Answer 8 · 2026-04-01 10:02:04

407

Views

Number of equivalence relations on a set with $kn$ elements with the condition that each equivalence class has n elements

Published on 01 Apr 2026 - 10:02

score 28 · Answer 9 · 2018-02-06 21:52:11

28

Views

Number of sets in 4 positions

Published on 06 Feb 2018 - 21:52

score 97 · Answer 10 · 2026-03-25 06:21:05

97

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How do I find $\sum_{k=2}^nk(k-1)\binom{n}{k}$

Published on 25 Mar 2026 - 6:21

score 218 · Answer 11 · 2026-03-26 03:12:41

218

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A lower bound for the number of 4-cycles in a graph

Published on 26 Mar 2026 - 3:12

score 244 · Answer 12 · 2026-03-25 22:06:05

244

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Find a recurrence relation for the number of strings in ternary that do not contain any repeated character.

Published on 25 Mar 2026 - 22:06

score 81 · Answer 13 · 2026-03-25 06:19:52

81

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Find, $\sum_{k=0}^{n}4^k \binom{n}{k}$

Published on 25 Mar 2026 - 6:19

score 68 · Answer 14 · 2018-02-07 00:58:10

68

Views

Nim with one pile full

Published on 07 Feb 2018 - 0:58

score 967 · Answer 15 · 2018-02-07 02:39:35

967

Views

$am+bn = 36$; What can you say about $gcd(m, n)$

Published on 07 Feb 2018 - 2:39

List Question

Inequality in Frankl's conjecture

$\forall n\in\mathbb N,x>-1,(1+x)^n\ge1+nx$ Using 2nd Derivative

Find $\sum_{k=0}^{n}4^k \binom{n}{k}$

How many ways are there to build a tower of 5 cubes height, out of red, yellow, blue, and green cubes, such that:

Show why the equation $F_{2n}=F_{n}^{2}+F_{n-1}^{2}$ is correct by taking an example from the staircase problem

Players tournament

What is the largest possible number of moves that can be taken to color the whole grid?

Number of equivalence relations on a set with $kn$ elements with the condition that each equivalence class has n elements

Number of sets in 4 positions

How do I find $\sum_{k=2}^nk(k-1)\binom{n}{k}$

A lower bound for the number of 4-cycles in a graph

Find a recurrence relation for the number of strings in ternary that do not contain any repeated character.

Find, $\sum_{k=0}^{n}4^k \binom{n}{k}$

Nim with one pile full

$am+bn = 36$; What can you say about $gcd(m, n)$

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