Question

What is the number of arrangements of 5 different things taken 3 at a time in which 2 particular thing always occur?

score 1.2k · Answer 1 · 2018-08-20 16:31:46

1.2k

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What is the number of arrangements of 5 different things taken 3 at a time in which 2 particular thing always occur?

Published on 20 Aug 2018 - 16:31

score 1.7k · Answer 2 · 2026-03-25 23:16:34

1.7k

Views

Number of labelled trees with exactly 3 leaves

Published on 25 Mar 2026 - 23:16

score 81 · Answer 3 · 2018-08-22 04:47:51

81

Views

How many numbers of 7 digits greater than 3500000 can be formed using the digits 1, 2, 2, 3, 3, 3, 7?

Published on 22 Aug 2018 - 4:47

score 100 · Answer 4 · 2018-08-22 18:20:47

100

Views

Permutations arrangement question

Published on 22 Aug 2018 - 18:20

score 5.5k · Answer 5 · 2018-08-23 01:14:00

5.5k

Views

Permutation with no two vowels next to each other

Published on 23 Aug 2018 - 1:14

score 524 · Answer 6 · 2026-03-25 19:05:00

524

Views

Why do we use ${n\choose k}$ for a binomial distribution instead of ${n+k-1\choose k}$?

Published on 25 Mar 2026 - 19:05

score 166 · Answer 7 · 2026-03-28 02:23:47

166

Views

proof with induction $\sum_{k=0}^n (-1)^k \binom{n}{k} (n-k+1)^n = n!$

Published on 28 Mar 2026 - 2:23

score 146 · Answer 8 · 2026-03-25 20:18:04

146

Views

Finding $\binom{n}{4}$ if $\binom{n}{6}=\binom{n}{9}$

Published on 25 Mar 2026 - 20:18

score 452 · Answer 9 · 2018-08-24 20:42:50

452

Views

What is the probability of matching color pens with the right color cap?

Published on 24 Aug 2018 - 20:42

score 469 · Answer 10 · 2026-02-25 07:46:36

469

Views

Avoiding exactly one permutation pattern

Published on 25 Feb 2026 - 7:46

score 94 · Answer 11 · 2018-08-25 10:21:29

94

Views

Arrangement of $15$ letters with restrictions on which letters are permitted in which positions

Published on 25 Aug 2018 - 10:21

score 13.8k · Answer 12 · 2018-08-25 11:52:25

13.8k

Views

Permutations- Restriction on two items placed next to each other.

Published on 25 Aug 2018 - 11:52

score 6.7k · Answer 13 · 2018-08-25 18:06:56

6.7k

Views

Ways to arrange books

Published on 25 Aug 2018 - 18:06

score 1.4k · Answer 14 · 2018-08-26 05:25:57

1.4k

Views

Permutation ( number of digits)

Published on 26 Aug 2018 - 5:25

score 129 · Answer 15 · 2018-08-26 06:17:14

129

Views

Permutation( ordering backpackers in hostels)

Published on 26 Aug 2018 - 6:17

List Question

What is the number of arrangements of 5 different things taken 3 at a time in which 2 particular thing always occur?

Number of labelled trees with exactly 3 leaves

How many numbers of 7 digits greater than 3500000 can be formed using the digits 1, 2, 2, 3, 3, 3, 7?

Permutations arrangement question

Permutation with no two vowels next to each other

Why do we use ${n\choose k}$ for a binomial distribution instead of ${n+k-1\choose k}$?

proof with induction $\sum_{k=0}^n (-1)^k \binom{n}{k} (n-k+1)^n = n!$

Finding $\binom{n}{4}$ if $\binom{n}{6}=\binom{n}{9}$

What is the probability of matching color pens with the right color cap?

Avoiding exactly one permutation pattern

Arrangement of $15$ letters with restrictions on which letters are permitted in which positions

Permutations- Restriction on two items placed next to each other.

Ways to arrange books

Permutation ( number of digits)

Permutation( ordering backpackers in hostels)

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