Question

Total no. of words formed when similar letters are involved

score 313 · Answer 1 · 2026-03-26 04:53:15

313

Views

Total no. of words formed when similar letters are involved

Published on 26 Mar 2026 - 4:53

score 1.2k · Answer 2 · 2026-03-25 06:07:12

1.2k

Views

How many unique combinations with $7$ digits can be formed in which there are $2$ sets of repeating numbers with the size $2$?

Published on 25 Mar 2026 - 6:07

score 68 · Answer 3 · 2018-04-02 23:30:50

68

Views

How many different arrangements of the letters in "HYPERGEOMETRIC" begin and end with "E"?

Published on 02 Apr 2018 - 23:30

score 318 · Answer 4 · 2026-03-25 04:19:09

318

Views

What is the minimum number of passwords needed to guarantee that at least $2$ passwords have the same number of lower case letters?

Published on 25 Mar 2026 - 4:19

score 49 · Answer 5 · 2018-04-03 14:22:56

49

Views

Binary submodular matrix

Published on 03 Apr 2018 - 14:22

score 128 · Answer 6 · 2026-03-26 01:28:05

128

Views

Combinatorial proof: $\sum_k {n+1 \brack k}k = {n+2 \brack 2}$

Published on 26 Mar 2026 - 1:28

score 25 · Answer 7 · 2018-04-03 18:40:21

25

Views

Permutation group. Show that the group has just three members of length 2 in cycle notation.

Published on 03 Apr 2018 - 18:40

score 410 · Answer 8 · 2026-03-25 00:01:35

410

Views

Looking for permutations of a specific riffle shuffle

Published on 25 Mar 2026 - 0:01

score 1.1k · Answer 9 · 2026-03-26 06:21:08

1.1k

Views

How many ways are there to arrange 4 letters from the word PROGRAM?

Published on 26 Mar 2026 - 6:21

score 52 · Answer 10 · 2018-04-04 12:56:48

52

Views

Is it possible to write this operation as a (series of) matrix operation(s)

Published on 04 Apr 2018 - 12:56

score 196 · Answer 11 · 2018-04-05 00:17:56

196

Views

Counting Problem (permutations) with making words?

Published on 05 Apr 2018 - 0:17

score 96 · Answer 12 · 2018-04-05 14:04:27

96

Views

How many permutations do you need to force fixed points?

Published on 05 Apr 2018 - 14:04

score 285 · Answer 13 · 2018-04-05 15:22:18

285

Views

Symmetric Group $S_3$ with mapping $\psi: S_3 \to S_3$ with $x \mapsto x^3$. Prove $\psi$ is not onto.

Published on 05 Apr 2018 - 15:22

score 1.7k · Answer 14 · 2026-03-25 10:52:05

1.7k

Views

Show that $S_n$ is not cyclic.

Published on 25 Mar 2026 - 10:52

score 57 · Answer 15 · 2018-04-06 22:02:52

57

Views

Combinatorics permutations of $n$ elements of which $k$ are optional and $n - k$ are mandatory

Published on 06 Apr 2018 - 22:02

List Question

Total no. of words formed when similar letters are involved

How many unique combinations with $7$ digits can be formed in which there are $2$ sets of repeating numbers with the size $2$?

How many different arrangements of the letters in "HYPERGEOMETRIC" begin and end with "E"?

What is the minimum number of passwords needed to guarantee that at least $2$ passwords have the same number of lower case letters?

Binary submodular matrix

Combinatorial proof: $\sum_k {n+1 \brack k}k = {n+2 \brack 2}$

Permutation group. Show that the group has just three members of length 2 in cycle notation.

Looking for permutations of a specific riffle shuffle

How many ways are there to arrange 4 letters from the word PROGRAM?

Is it possible to write this operation as a (series of) matrix operation(s)

Counting Problem (permutations) with making words?

How many permutations do you need to force fixed points?

Symmetric Group $S_3$ with mapping $\psi: S_3 \to S_3$ with $x \mapsto x^3$. Prove $\psi$ is not onto.

Show that $S_n$ is not cyclic.

Combinatorics permutations of $n$ elements of which $k$ are optional and $n - k$ are mandatory

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