Question

A party contradicting Handshaking Lemma

score 865 · Answer 1 · 2026-03-25 15:59:24

865

Views

A party contradicting Handshaking Lemma

Published on 25 Mar 2026 - 15:59

score 5.7k · Answer 2 · 2026-03-25 09:28:14

5.7k

Views

How many ways are there to make a sundae with two toppings if double toppings are allowed?

Published on 25 Mar 2026 - 9:28

score 2k · Answer 3 · 2026-03-25 16:06:34

2k

Views

self-complementary graph: Number of Edges

Published on 25 Mar 2026 - 16:06

score 328 · Answer 4 · 2026-03-27 02:52:32

328

Views

Counting particular odd-length strings over a two letter alphabet.

Published on 27 Mar 2026 - 2:52

score 95 · Answer 5 · 2018-01-27 23:32:07

95

Views

Why is my work incorrect?

Published on 27 Jan 2018 - 23:32

score 80 · Answer 6 · 2018-01-28 02:57:07

80

Views

Astrological Sign Doors

Published on 28 Jan 2018 - 2:57

score 35 · Answer 7 · 2018-01-28 06:12:51

35

Views

Number of ways of distributing 2 distinct balls in 2 distinct bins is 4, but why not 6?

Published on 28 Jan 2018 - 6:12

score 732 · Answer 8 · 2018-01-28 06:28:34

732

Views

Proof of the identity $\sum_{k=0}^{n}\binom {2k}{k}\binom {2(n-k)}{n-k}=4^n$

Published on 28 Jan 2018 - 6:28

score 502 · Answer 9 · 2026-03-25 07:44:59

502

Views

How many nondecreasing functions $f: \{1, 2, 3, \ldots, 15\} \to \{1, 2, 3, 4, 5\}$ are there?

Published on 25 Mar 2026 - 7:44

score 468 · Answer 10 · 2026-03-25 13:55:33

468

Views

Birthday probability of $k$ people and $n$ days a year such that at least $2$ people have the same bday

Published on 25 Mar 2026 - 13:55

score 269 · Answer 11 · 2026-03-25 14:16:45

269

Views

Find $F(n,k)$ number of monotonic sequences in length $k$ from $n$ elements $\{1,2,3,..,n\}$

Published on 25 Mar 2026 - 14:16

score 190 · Answer 12 · 2026-03-25 11:06:42

190

Views

Number of ways of selecting 3 numbers from a set in a given condition

Published on 25 Mar 2026 - 11:06

score 47 · Answer 13 · 2018-01-28 14:09:02

47

Views

Confusing permutation? Or combination?

Published on 28 Jan 2018 - 14:09

score 250 · Answer 14 · 2026-03-31 12:13:31

250

Views

Password Problem

Published on 31 Mar 2026 - 12:13

score 143 · Answer 15 · 2026-03-26 15:54:28

143

Views

Number of permutations of 5 boys sitting in a row in such a way that at least one boy sticks to his original seat

Published on 26 Mar 2026 - 15:54

List Question

A party contradicting Handshaking Lemma

How many ways are there to make a sundae with two toppings if double toppings are allowed?

self-complementary graph: Number of Edges

Counting particular odd-length strings over a two letter alphabet.

Why is my work incorrect?

Astrological Sign Doors

Number of ways of distributing 2 distinct balls in 2 distinct bins is 4, but why not 6?

Proof of the identity $\sum_{k=0}^{n}\binom {2k}{k}\binom {2(n-k)}{n-k}=4^n$

How many nondecreasing functions $f: \{1, 2, 3, \ldots, 15\} \to \{1, 2, 3, 4, 5\}$ are there?

Birthday probability of $k$ people and $n$ days a year such that at least $2$ people have the same bday

Find $F(n,k)$ number of monotonic sequences in length $k$ from $n$ elements $\{1,2,3,..,n\}$

Number of ways of selecting 3 numbers from a set in a given condition

Confusing permutation? Or combination?

Password Problem

Number of permutations of 5 boys sitting in a row in such a way that at least one boy sticks to his original seat

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