List questions from recreational-mathematics

Published on 15 Mar 2017 - 6:30

143

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When does $n!$ have exactly $n$ zeroes?

Published on 01 Apr 2026 - 15:34

157

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Integrating a hedgehog

Published on 30 Mar 2026 - 14:54

105

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Basic math question bugging me.

Published on 07 Apr 2026 - 1:35

494

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"A Queer Coincidence," riddle from Dudeney's book

Published on 16 Mar 2017 - 16:18

151

Views

Degree of vertex in left part of a bipartite graph with distance less than 3 in right part.

Published on 16 Mar 2017 - 22:23

241

Views

"Very Large Numbers"

Published on 16 Mar 2017 - 23:26

367

Views

2 aliens walk on a line meeting probability.

Published on 03 Apr 2026 - 10:06

233

Views

Maximum $2$-D bootstrap percolation time for $n$ points on an $n\times n$ grid

Published on 29 Mar 2026 - 18:17

539

Views

What is the expected value of a lottery ticket if one could wait finitely many draws to try to get the highest prize?

Published on 23 Feb 2026 - 10:22

195

Views

Olympiad Function Question

Published on 19 Mar 2017 - 22:16

33

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Is the normality of two normal numbers preserved under pairwise concatenation of their digits?

Published on 21 Mar 2017 - 15:59

3k

Views

A Drunken Prison Guard.

Published on 22 Mar 2017 - 12:30

79

Views

How to find $\frac{\partial (xy)}{\partial (x+y)}$

Published on 22 Mar 2017 - 12:54

29

Views

Mathematical induction proving positive integers

Published on 23 Mar 2017 - 7:16

List Question

What is the Purpose (and useful examples) of Expressions?

When does $n!$ have exactly $n$ zeroes?

Integrating a hedgehog

Basic math question bugging me.

"A Queer Coincidence," riddle from Dudeney's book

Degree of vertex in left part of a bipartite graph with distance less than 3 in right part.

"Very Large Numbers"

2 aliens walk on a line meeting probability.

Maximum $2$-D bootstrap percolation time for $n$ points on an $n\times n$ grid

What is the expected value of a lottery ticket if one could wait finitely many draws to try to get the highest prize?

Olympiad Function Question

Is the normality of two normal numbers preserved under pairwise concatenation of their digits?

A Drunken Prison Guard.

How to find $\frac{\partial (xy)}{\partial (x+y)}$

Mathematical induction proving positive integers

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