Question

How many 3-digit numbers divisible by 3 have no digits that are individually divisible by 3?

score 856 · Answer 1 · 2026-03-25 13:13:35

856

Views

How many 3-digit numbers divisible by 3 have no digits that are individually divisible by 3?

Published on 25 Mar 2026 - 13:13

score 27 · Answer 2 · 2026-03-29 04:34:30

27

Views

Counting perfect matches in a reduced version of the complete bipartite graph

Published on 29 Mar 2026 - 4:34

score 41 · Answer 3 · 2026-03-25 07:44:02

41

Views

proof about one of the claims in Partition

Published on 25 Mar 2026 - 7:44

score 237 · Answer 4 · 2026-03-28 04:35:08

237

Views

How to calculate sum over set of vectors $\sum\limits_{\vec q\in E}f(\vec q)$?

Published on 28 Mar 2026 - 4:35

score 457 · Answer 5 · 2018-04-19 07:09:07

3 red, 3 blue and 3 green beads are arranged in a circle. What is the probability that each bead has at least one neighboring bead of other color?

score 82 · Answer 6 · 2026-03-26 07:59:20

82

Views

prove the vector sum of all of them is $\vec{0}$

Published on 26 Mar 2026 - 7:59

score 58 · Answer 7 · 2026-04-07 18:25:57

58

Views

Equation for inductive relationship determining counts of binary sequences

Published on 07 Apr 2026 - 18:25

score 4.2k · Answer 8 · 2018-04-19 14:26:54

4.2k

Views

Strictly Increasing Integers

Published on 19 Apr 2018 - 14:26

score 43 · Answer 9 · 2018-04-19 17:20:01

43

Views

How many integers solutions are there for the inequation: $|X_{1}|+|X_{2}|+\cdots+|X_{k}|\le n$

Published on 19 Apr 2018 - 17:20

score 43 · Answer 10 · 2018-04-19 17:34:13

43

Views

In how many primitive pythagorean triples can some odd integer $a$ be a non-hypoteneuse edge?

Published on 19 Apr 2018 - 17:34

score 1.6k · Answer 11 · 2026-03-29 04:34:42

1.6k

Views

Chromatic number of complement of cycle graph

Published on 29 Mar 2026 - 4:34

score 39 · Answer 12 · 2018-04-19 18:06:25

39

Views

simple counting problem causing confusion (foundamental counting principle)

Published on 19 Apr 2018 - 18:06

score 96 · Answer 13 · 2026-03-29 04:34:28

96

Views

Write numbers $1,2,3,...,r$ on the edges of $K_n$

Published on 29 Mar 2026 - 4:34

score 165 · Answer 14 · 2026-04-07 17:31:25

165

Views

lock pattern possibilities when starting from corner only

Published on 07 Apr 2026 - 17:31

score 210 · Answer 15 · 2026-04-01 14:30:45

210

Views

Catalan Numbers and Geometric Series Combo

Published on 01 Apr 2026 - 14:30

List Question

How many 3-digit numbers divisible by 3 have no digits that are individually divisible by 3?

Counting perfect matches in a reduced version of the complete bipartite graph

proof about one of the claims in Partition

How to calculate sum over set of vectors $\sum\limits_{\vec q\in E}f(\vec q)$?

3 red, 3 blue and 3 green beads are arranged in a circle. What is the probability that each bead has at least one neighboring bead of other color?

prove the vector sum of all of them is $\vec{0}$

Equation for inductive relationship determining counts of binary sequences

Strictly Increasing Integers

How many integers solutions are there for the inequation: $|X_{1}|+|X_{2}|+\cdots+|X_{k}|\le n$

In how many primitive pythagorean triples can some odd integer $a$ be a non-hypoteneuse edge?

Chromatic number of complement of cycle graph

simple counting problem causing confusion (foundamental counting principle)

Write numbers $1,2,3,...,r$ on the edges of $K_n$

lock pattern possibilities when starting from corner only

Catalan Numbers and Geometric Series Combo

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