Question

Find a recurrence relation that gives a formula for the number of arrangements of wins and losses for aN (you stop playing at 3 losses in a row).

score 266 · Answer 1 · 2026-04-15 14:47:14

266

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Find a recurrence relation that gives a formula for the number of arrangements of wins and losses for aN (you stop playing at 3 losses in a row).

Published on 15 Apr 2026 - 14:47

score 2.1k · Answer 2 · 2026-04-11 21:37:42

2.1k

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Where my logic went wrong while solving this probability problem from Sheldon Ross' book?

Published on 11 Apr 2026 - 21:37

score 198 · Answer 3 · 2026-04-13 22:12:25

198

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An urn contains n balls numbered $2^i,i=0,\dots,n-1$. Select two w/o replacement -- what is the EV of the sum of 2 balls?

Published on 13 Apr 2026 - 22:12

score 58 · Answer 4 · 2026-04-17 07:00:24

58

Views

Let $f(n)$ be the number of simple undricted graphs with $n$ vertices numbered ${1,2,\dots,n}$ s.t every vertex degree is 2.

Published on 17 Apr 2026 - 7:00

score 88 · Answer 5 · 2026-04-18 07:38:05

88

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Does a concave polygon always include a convex poligon?

Published on 18 Apr 2026 - 7:38

score 616 · Answer 6 · 2026-04-09 06:44:18

616

Views

Proof of a Combinatorial Abel Identity

Published on 09 Apr 2026 - 6:44

score 1.2k · Answer 7 · 2026-03-25 06:05:28

1.2k

Views

What are the two possible solutions to this round of Mastermind?

Published on 25 Mar 2026 - 6:05

score 200 · Answer 8 · 2026-04-16 00:33:29

200

Views

Prove $\sum_{k=0}^{n}k*p_n(k)=n!$

Published on 16 Apr 2026 - 0:33

score 158 · Answer 9 · 2026-04-13 23:03:32

158

Views

"A combinations problem." There are $10$ halting stations on a circular road in a city....

Published on 13 Apr 2026 - 23:03

score 524 · Answer 10 · 2026-04-13 23:09:19

524

Views

In how many ways we can collect a total of $20$ dollars

Published on 13 Apr 2026 - 23:09

score 94 · Answer 11 · 2026-04-17 04:03:46

94

Views

Cyclotomic scheme is a Association scheme

Published on 17 Apr 2026 - 4:03

score 75 · Answer 12 · 2026-04-16 04:55:36

75

Views

Counting vertex covers of size ((r+1)/2) +1 for an odd hole of size r

Published on 16 Apr 2026 - 4:55

score 106 · Answer 13 · 2026-04-14 10:46:09

106

Views

In a network like Facebook, how many distinct user profiles can one manufacturer access if it can access each device owner's friends of friends?

Published on 14 Apr 2026 - 10:46

score 249 · Answer 14 · 2026-04-16 10:42:01

249

Views

Subset sum problem -> large array, known number of subset elements

Published on 16 Apr 2026 - 10:42

score 121 · Answer 15 · 2026-04-14 14:47:16

121

Views

Choosing 3 of 5 objects in one of two groups from 12 objects in several groups

Published on 14 Apr 2026 - 14:47

List Question

Find a recurrence relation that gives a formula for the number of arrangements of wins and losses for aN (you stop playing at 3 losses in a row).

Where my logic went wrong while solving this probability problem from Sheldon Ross' book?

An urn contains n balls numbered $2^i,i=0,\dots,n-1$. Select two w/o replacement -- what is the EV of the sum of 2 balls?

Let $f(n)$ be the number of simple undricted graphs with $n$ vertices numbered ${1,2,\dots,n}$ s.t every vertex degree is 2.

Does a concave polygon always include a convex poligon?

Proof of a Combinatorial Abel Identity

What are the two possible solutions to this round of Mastermind?

Prove $\sum_{k=0}^{n}k*p_n(k)=n!$

"A combinations problem." There are $10$ halting stations on a circular road in a city....

In how many ways we can collect a total of $20$ dollars

Cyclotomic scheme is a Association scheme

Counting vertex covers of size ((r+1)/2) +1 for an odd hole of size r

In a network like Facebook, how many distinct user profiles can one manufacturer access if it can access each device owner's friends of friends?

Subset sum problem -> large array, known number of subset elements

Choosing 3 of 5 objects in one of two groups from 12 objects in several groups

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