Question

How many different playlists can you make if you allow repeated songs?

score 1.5k · Answer 1 · 2026-04-15 03:40:54

How many different playlists can you make if you allow repeated songs?

Published on 15 Apr 2026 - 3:40

score 74 · Answer 2 · 2026-04-15 17:43:14

How many permutations of {A, B, C, D, E, F, G, H, I} are there in which the first character is A, B, or C and the last character is G, H, or I?

score 986 · Answer 3 · 2026-04-12 13:04:11

986

Views

Stirling's Formula for n!

Published on 12 Apr 2026 - 13:04

score 64 · Answer 4 · 2026-04-13 02:30:02

64

Views

Cardinality of $\{(x, y)\mid x \in y \}$ for Finite Stages of von Neumann Universe

Published on 13 Apr 2026 - 2:30

score 40 · Answer 5 · 2026-04-15 19:53:47

40

Views

Arranging participants in a line

Published on 15 Apr 2026 - 19:53

score 3.5k · Answer 6 · 2026-04-16 14:00:55

3.5k

Views

Find all combinations that sum up to a specific number

Published on 16 Apr 2026 - 14:00

score 461 · Answer 7 · 2026-04-15 07:27:13

461

Views

Find a recursive definition of this sequence

Published on 15 Apr 2026 - 7:27

score 670 · Answer 8 · 2026-04-15 23:05:37

670

Views

How many unique ways are there to cut a rod?

Published on 15 Apr 2026 - 23:05

score 1.2k · Answer 9 · 2026-04-10 14:59:22

1.2k

Views

Convert class schedule problem to coloring problem?

Published on 10 Apr 2026 - 14:59

score 36 · Answer 10 · 2026-04-16 06:44:23

36

Views

How many even $4$-digit numbers can be made such that the sum of ones and tens $=4$??

Published on 16 Apr 2026 - 6:44

score 80 · Answer 11 · 2026-04-14 16:58:10

80

Views

Show that $[\sum\limits_{k = 0}^n\binom{n}{k}]^2=\sum\limits_{r = 0}^{2n}\binom{2n}{r}$

Published on 14 Apr 2026 - 16:58

score 60 · Answer 12 · 2026-04-16 00:13:46

60

Views

Evaluate $\sum\limits_{k = 0}^n \binom{n}{n-k} \binom{m}{k}$. Give combinatorical arguments.

Published on 16 Apr 2026 - 0:13

score 155 · Answer 13 · 2026-04-15 16:43:21

What is the probability that the most common 3 results of 12 equally likely outcomes are selected by at least 11 of a sample of size 22?

score 656 · Answer 14 · 2026-05-11 05:33:26

656

Views

Give a proof by contradiction to show if the odd integers $1,3,5,7,9,11,13,15,17,19,$ are placed around a circle...

Published on 11 May 2026 - 5:33

score 65 · Answer 15 · 2026-04-13 11:40:53

In how many ways can you roll $3$ regular distinguishable dice, such that the sum of points on their top surface is 8?

List Question

How many different playlists can you make if you allow repeated songs?

How many permutations of {A, B, C, D, E, F, G, H, I} are there in which the first character is A, B, or C and the last character is G, H, or I?

Stirling's Formula for n!

Cardinality of $\{(x, y)\mid x \in y \}$ for Finite Stages of von Neumann Universe

Arranging participants in a line

Find all combinations that sum up to a specific number

Find a recursive definition of this sequence

How many unique ways are there to cut a rod?

Convert class schedule problem to coloring problem?

How many even $4$-digit numbers can be made such that the sum of ones and tens $=4$??

Show that $[\sum\limits_{k = 0}^n\binom{n}{k}]^2=\sum\limits_{r = 0}^{2n}\binom{2n}{r}$

Evaluate $\sum\limits_{k = 0}^n \binom{n}{n-k} \binom{m}{k}$. Give combinatorical arguments.

What is the probability that the most common 3 results of 12 equally likely outcomes are selected by at least 11 of a sample of size 22?

Give a proof by contradiction to show if the odd integers $1,3,5,7,9,11,13,15,17,19,$ are placed around a circle...

In how many ways can you roll $3$ regular distinguishable dice, such that the sum of points on their top surface is 8?

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