List questions from recreational-mathematics

Published on 12 Apr 2026 - 12:02

96

Views

Changing the state of coins and finding the minimum number of steps to do it

Published on 12 Apr 2026 - 17:55

770

Views

Is every arrangement reachable by shuffling this way?

Published on 09 Apr 2026 - 8:34

93

Views

Placing $4n$ non-attaking queens of in a $4n \times 4n$ chessboard.

Published on 27 Jan 2015 - 14:04

1.1k

Views

Probability of getting 6 letters right

Published on 10 Apr 2026 - 17:31

9k

Views

Arc length contest! Minimize the arc length of $f(x)$ when given three conditions.

Published on 29 Mar 2026 - 14:02

166

Views

Find all points on the line 9x-21y=6

Published on 28 Jan 2015 - 7:04

186

Views

Explaining a Pattern in a Matrix Generated by Minimum Excluded Number in Rows & Columns

Published on 30 Mar 2026 - 4:44

121

Views

What are some interesting, atypical mathematical topics that a student who has taken an introductory calculus sequence can learn about?

Published on 12 Apr 2026 - 12:28

1.3k

Views

Arranging identical balls in a circle

Published on 29 Jan 2015 - 17:05

125

Views

Is the solution to this elementary number theory problem correct?

Published on 29 Jan 2015 - 23:37

294

Views

Olympic number theory problem: is this solution fine and sufficiently well written?

Published on 12 Apr 2026 - 11:26

1.5k

Views

Hank and his old car

Published on 02 Feb 2015 - 10:29

7.3k

Views

"The Bachelorette Problem" (slightly adapted from Tao's Google+ account)

Published on 02 Feb 2015 - 14:25

270

Views

Given $A \subseteq \mathbf{Z}$ and $x\in \mathbf{Z}$, we say that $x$ is $A$-mirrored if and only if $−x\in A$. We also define...

Published on 01 Apr 2026 - 13:14

List Question

Rigorous proof for a maximization problem

Changing the state of coins and finding the minimum number of steps to do it

Is every arrangement reachable by shuffling this way?

Placing $4n$ non-attaking queens of in a $4n \times 4n$ chessboard.

Probability of getting 6 letters right

Arc length contest! Minimize the arc length of $f(x)$ when given three conditions.

Find all points on the line 9x-21y=6

Explaining a Pattern in a Matrix Generated by Minimum Excluded Number in Rows & Columns

What are some interesting, atypical mathematical topics that a student who has taken an introductory calculus sequence can learn about?

Arranging identical balls in a circle

Is the solution to this elementary number theory problem correct?

Olympic number theory problem: is this solution fine and sufficiently well written?

Hank and his old car

"The Bachelorette Problem" (slightly adapted from Tao's Google+ account)

Given $A \subseteq \mathbf{Z}$ and $x\in \mathbf{Z}$, we say that $x$ is $A$-mirrored if and only if $−x\in A$. We also define...

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