Question

How many distinct four-letter words beginning with A can be formed from letters with two similar letters and two different letters?

score 260 · Answer 1 · 2026-04-17 10:48:12

How many distinct four-letter words beginning with A can be formed from letters with two similar letters and two different letters?

score 63 · Answer 2 · 2026-04-09 04:06:45

63

Views

why the following solution can't be true about filling a $4\times n$ with board with dominoes

Published on 09 Apr 2026 - 4:06

score 48 · Answer 3 · 2026-04-11 00:32:07

48

Views

Single number set problem

Published on 11 Apr 2026 - 0:32

score 39 · Answer 4 · 2026-04-09 05:33:36

39

Views

Total number of bit-strings that start with 3 ones and end with 2 ones

Published on 09 Apr 2026 - 5:33

score 54 · Answer 5 · 2026-04-14 07:17:55

54

Views

counting, circular permutation

Published on 14 Apr 2026 - 7:17

score 162 · Answer 6 · 2026-04-14 10:47:46

162

Views

Proof Verification $\sum_{k=0}^n \binom{n}{k} = 2^n$ (Spivak's Calculus)

Published on 14 Apr 2026 - 10:47

score 539 · Answer 7 · 2026-04-15 00:12:32

539

Views

How many paths in a $n\times m$ grid which is not crossing the diagonal.

Published on 15 Apr 2026 - 0:12

score 169 · Answer 8 · 2026-04-11 22:59:14

169

Views

Summation With Binomial Coefficient

Published on 11 Apr 2026 - 22:59

score 60 · Answer 9 · 2026-04-16 02:32:52

60

Views

Prove -1 Transformation (A binomial identity):$\binom{-p}{q}=\binom{p+q-1}{q}(-1)^q$

Published on 16 Apr 2026 - 2:32

score 398 · Answer 10 · 2026-04-14 22:19:48

398

Views

What's the formula for the number of possible answers to this puzzle?

Published on 14 Apr 2026 - 22:19

score 53 · Answer 11 · 2026-04-15 00:04:04

53

Views

Number of sequences formed from $1, 1, 1, 2,3,4,5,6$ in which all three $1$s appear before the $6$

Published on 15 Apr 2026 - 0:04

score 44 · Answer 12 · 2026-04-11 17:11:07

44

Views

String permutations: ways to reorder DONALDDUCK with restrictions:

Published on 11 Apr 2026 - 17:11

score 104 · Answer 13 · 2026-04-29 12:52:08

104

Views

A latin square of order $n$ has a weak transversal.

Published on 29 Apr 2026 - 12:52

score 95 · Answer 14 · 2026-04-12 17:22:08

95

Views

How to determine the number of combinations?

Published on 12 Apr 2026 - 17:22

score 636 · Answer 15 · 2026-04-14 01:46:07

636

Views

Hall's theorem using Konig Egervary max min theorem for matrices.

Published on 14 Apr 2026 - 1:46

List Question

How many distinct four-letter words beginning with A can be formed from letters with two similar letters and two different letters?

why the following solution can't be true about filling a $4\times n$ with board with dominoes

Single number set problem

Total number of bit-strings that start with 3 ones and end with 2 ones

counting, circular permutation

Proof Verification $\sum_{k=0}^n \binom{n}{k} = 2^n$ (Spivak's Calculus)

How many paths in a $n\times m$ grid which is not crossing the diagonal.

Summation With Binomial Coefficient

Prove -1 Transformation (A binomial identity):$\binom{-p}{q}=\binom{p+q-1}{q}(-1)^q$

What's the formula for the number of possible answers to this puzzle?

Number of sequences formed from $1, 1, 1, 2,3,4,5,6$ in which all three $1$s appear before the $6$

String permutations: ways to reorder DONALDDUCK with restrictions:

A latin square of order $n$ has a weak transversal.

How to determine the number of combinations?

Hall's theorem using Konig Egervary max min theorem for matrices.

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