Question

Strings of length $n$ formed by $a,b,c$ where $a$ and $b$ are not adjacent

score 254 · Answer 1 · 2026-04-16 19:16:13

254

Views

Strings of length $n$ formed by $a,b,c$ where $a$ and $b$ are not adjacent

Published on 16 Apr 2026 - 19:16

score 104 · Answer 2 · 2026-04-13 04:27:37

104

Views

What is wrong with my method of computing combinations for this GRE question?

Published on 13 Apr 2026 - 4:27

score 356 · Answer 3 · 2026-04-15 02:10:08

356

Views

Absolute sum of partitioned Rademacher variables

Published on 15 Apr 2026 - 2:10

score 635 · Answer 4 · 2026-04-15 19:10:15

635

Views

What is the number of subsets of $\{1, ..., n\}$ which sum to a given number $k \leq \frac{n(n+1)}{2}$?

Published on 15 Apr 2026 - 19:10

score 443 · Answer 5 · 2026-04-09 23:28:14

443

Views

Probability of selecting exactly $2$ of the best $3$ manufacturers

Published on 09 Apr 2026 - 23:28

score 2k · Answer 6 · 2026-05-10 20:39:16

2k

Views

How many numbers are there which only contain digits $4$ and $7$ in them?

Published on 10 May 2026 - 20:39

score 139 · Answer 7 · 2026-05-06 10:03:09

139

Views

Is it possible to prove that $M$ is an integer with $p+M \over x$ is always an integer?

Published on 06 May 2026 - 10:03

score 1k · Answer 8 · 2026-05-10 20:08:24

1k

Views

The ways of covering a $4\times 4$ square by $1\times 2$ colored dominoes

Published on 10 May 2026 - 20:08

score 115 · Answer 9 · 2026-04-14 13:17:17

115

Views

Number of ways to place subset of balls between balls

Published on 14 Apr 2026 - 13:17

score 68 · Answer 10 · 2026-05-10 19:25:21

68

Views

How to seat guests in circles of chairs if each one wants to have free seats to his left and right?

Published on 10 May 2026 - 19:25

score 63 · Answer 11 · 2026-04-15 23:27:00

63

Views

Prove that $\binom{n+2} {k} = \binom{n} k + 2\binom n {k-1} + \binom n {k-2}$

Published on 15 Apr 2026 - 23:27

score 142 · Answer 12 · 2026-04-10 17:10:10

142

Views

Summation involving factorials

Published on 10 Apr 2026 - 17:10

score 62 · Answer 13 · 2026-04-12 13:54:18

62

Views

Counting number of integer solutions. Transforming restrictions / Grimaldi

Published on 12 Apr 2026 - 13:54

score 62 · Answer 14 · 2026-05-11 04:37:45

62

Views

Number of intersections formed by chords connecting all N evenly spaced nodes on a circle

Published on 11 May 2026 - 4:37

score 189 · Answer 15 · 2026-04-08 20:52:56

189

Views

Counting Strings

Published on 08 Apr 2026 - 20:52

List Question

Strings of length $n$ formed by $a,b,c$ where $a$ and $b$ are not adjacent

What is wrong with my method of computing combinations for this GRE question?

Absolute sum of partitioned Rademacher variables

What is the number of subsets of $\{1, ..., n\}$ which sum to a given number $k \leq \frac{n(n+1)}{2}$?

Probability of selecting exactly $2$ of the best $3$ manufacturers

How many numbers are there which only contain digits $4$ and $7$ in them?

Is it possible to prove that $M$ is an integer with $p+M \over x$ is always an integer?

The ways of covering a $4\times 4$ square by $1\times 2$ colored dominoes

Number of ways to place subset of balls between balls

How to seat guests in circles of chairs if each one wants to have free seats to his left and right?

Prove that $\binom{n+2} {k} = \binom{n} k + 2\binom n {k-1} + \binom n {k-2}$

Summation involving factorials

Counting number of integer solutions. Transforming restrictions / Grimaldi

Number of intersections formed by chords connecting all N evenly spaced nodes on a circle

Counting Strings

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