Question

Intuitive (combinatorial) proof of $2^n=\sum_{k=0}^n {n\choose k}$

score 3.3k · Answer 1 · 2026-03-25 02:31:33

3.3k

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Intuitive (combinatorial) proof of $2^n=\sum_{k=0}^n {n\choose k}$

Published on 25 Mar 2026 - 2:31

score 265 · Answer 2 · 2026-03-25 11:53:17

265

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Find number of functions

Published on 25 Mar 2026 - 11:53

score 1k · Answer 3 · 2018-01-30 15:34:31

1k

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Problem reasoning through combinatorial probability problem

Published on 30 Jan 2018 - 15:34

score 673 · Answer 4 · 2018-01-30 15:41:06

673

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Distributing fruits to 3 people.

Published on 30 Jan 2018 - 15:41

score 2.2k · Answer 5 · 2026-03-25 09:29:49

2.2k

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How many ways are there to pick a collection of 8 coins from piles of pennies, nickels, dimes, and quarters?

Published on 25 Mar 2026 - 9:29

score 444 · Answer 6 · 2026-03-26 17:19:59

444

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Number of distinct dodecahedra given a multiset of edge colors. Burnside's lemma.

Published on 26 Mar 2026 - 17:19

score 122 · Answer 7 · 2026-04-01 08:01:38

122

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How to explain this 4! in the answer of this discrete math problem?

Published on 01 Apr 2026 - 8:01

score 214 · Answer 8 · 2026-03-25 19:03:06

214

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Counting labelled graphs with k edges and n vertices

Published on 25 Mar 2026 - 19:03

score 31 · Answer 9 · 2026-03-25 01:21:26

31

Views

Matching pans with a fitting lid

Published on 25 Mar 2026 - 1:21

score 91 · Answer 10 · 2018-01-31 02:40:27

91

Views

Proving Probability Statement via Axioms of Probability and Set Identities

Published on 31 Jan 2018 - 2:40

score 3.8k · Answer 11 · 2018-01-31 03:37:45

3.8k

Views

Calculating keno odds?

Published on 31 Jan 2018 - 3:37

score 81 · Answer 12 · 2018-01-31 05:48:06

81

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Expected number of unlike pairs when drawing from a set containing two types of items

Published on 31 Jan 2018 - 5:48

score 69 · Answer 13 · 2026-03-25 09:29:04

69

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How can I calculate this probability? (Nobody chooses a number and at least two choose all the ones below it)

Published on 25 Mar 2026 - 9:29

score 70 · Answer 14 · 2018-01-31 11:17:33

70

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How many ways can you list numbers $1,2,3,...,n$ so that no number $i$ is in its $ith$ place on the list?

Published on 31 Jan 2018 - 11:17

score 37 · Answer 15 · 2018-01-31 11:30:22

37

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How to use recurrence relation to obtain generating function

Published on 31 Jan 2018 - 11:30

List Question

Intuitive (combinatorial) proof of $2^n=\sum_{k=0}^n {n\choose k}$

Find number of functions

Problem reasoning through combinatorial probability problem

Distributing fruits to 3 people.

How many ways are there to pick a collection of 8 coins from piles of pennies, nickels, dimes, and quarters?

Number of distinct dodecahedra given a multiset of edge colors. Burnside's lemma.

How to explain this 4! in the answer of this discrete math problem?

Counting labelled graphs with k edges and n vertices

Matching pans with a fitting lid

Proving Probability Statement via Axioms of Probability and Set Identities

Calculating keno odds?

Expected number of unlike pairs when drawing from a set containing two types of items

How can I calculate this probability? (Nobody chooses a number and at least two choose all the ones below it)

How many ways can you list numbers $1,2,3,...,n$ so that no number $i$ is in its $ith$ place on the list?

How to use recurrence relation to obtain generating function

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